vec_fmt_datetime: Format a vector as datetime values
In rstudio/gt: Easily Create Presentation-Ready Display Tables
vec_fmt_datetime R Documentation
Format a vector as datetime values
Description
Format values in a vector to datetime values using either presets for the
date and time components or a formatting directive (this can either use a
CLDR datetime pattern or strptime formatting). Input can be in the form
of POSIXct (i.e., datetimes), the Date type, or character (must be in
the ISO 8601 form of YYYY-MM-DD HH:MM:SS or YYYY-MM-DD).
Usage
vec_fmt_datetime(
x,
date_style = "iso",
time_style = "iso",
sep = " ",
format = NULL,
tz = NULL,
pattern = "{x}",
locale = NULL,
output = c("auto", "plain", "html", "latex", "rtf", "word")
)
Arguments
x
The input vector
vector(numeric|integer) // required
This is the input vector that will undergo transformation to a character
vector of the same length. Values within the vector will be formatted.
date_style
Predefined style for dates
scalar<character>|scalar<numeric|integer>(1<=val<=41) // default: "iso"
The date style to use. By default this is the short name "iso" which
corresponds to ISO 8601 date formatting. There are 41 date styles in total
and their short names can be viewed using info_date_style().
time_style
Predefined style for times
scalar<character>|scalar<numeric|integer>(1<=val<=25) // default: "iso"
The time style to use. By default this is the short name "iso" which
corresponds to how times are formatted within ISO 8601 datetime values.
There are 25 time styles in total and their short names can be viewed using
info_time_style().
sep
Separator between date and time components
scalar<character> // default: " "
The separator string to use between the date and time components. By
default, this is a single space character (" "). Only used when not
specifying a format code.
format
Date/time formatting string
scalar<character> // default: NULL (optional)
An optional formatting string used for generating custom dates/times. If
used then the arguments governing preset styles (date_style and
time_style) will be ignored in favor of formatting via the format
string.
tz
Time zone
scalar<character> // default: NULL (optional)
The time zone for printing dates/times (i.e., the output). The
default of NULL will preserve the time zone of the input data in the
output. If providing a time zone, it must be one that is recognized by the
user's operating system (a vector of all valid tz values can be produced
with OlsonNames()).
pattern
Specification of the formatting pattern
scalar<character> // default: "{x}"
A formatting pattern that allows for decoration of the formatted value. The
formatted value is represented by the {x} (which can be used multiple
times, if needed) and all other characters will be interpreted as string
literals.
locale
Locale identifier
scalar<character> // default: NULL (optional)
An optional locale identifier that can be used for formatting values
according to the locale's rules. Examples include "en" for English (United
States) and "fr" for French (France). We can call info_locales() for a
useful reference for all of the locales that are supported.
output
Output format
singl-kw:[auto|plain|html|latex|rtf|word] // default: "auto"
The output style of the resulting character vector. This can either be
"auto" (the default), "plain", "html", "latex", "rtf", or
"word". In knitr rendering (i.e., Quarto or R Markdown), the "auto"
option will choose the correct output value
Value
A character vector.
Formatting with the date_style argument
We can supply a preset date style to the date_style argument to separately
handle the date portion of the output. The date styles are numerous and can
handle localization to any supported locale. A large segment of date styles
are termed flexible date formats and this means that their output will adapt
to any locale provided. That feature makes the flexible date formats a
better option for locales other than "en" (the default locale).
The following table provides a listing of all date styles and their output
values (corresponding to an input date of 2000-02-29).
Date Style Output Notes
1 "iso" "2000-02-29" ISO 8601
2 "wday_month_day_year" "Tuesday, February 29, 2000"
3 "wd_m_day_year" "Tue, Feb 29, 2000"
4 "wday_day_month_year" "Tuesday 29 February 2000"
5 "month_day_year" "February 29, 2000"
6 "m_day_year" "Feb 29, 2000"
7 "day_m_year" "29 Feb 2000"
8 "day_month_year" "29 February 2000"
9 "day_month" "29 February"
10 "day_m" "29 Feb"
11 "year" "2000"
12 "month" "February"
13 "day" "29"
14 "year.mn.day" "2000/02/29"
15 "y.mn.day" "00/02/29"
16 "year_week" "2000-W09"
17 "year_quarter" "2000-Q1"
18 "yMd" "2/29/2000" flexible
19 "yMEd" "Tue, 2/29/2000" flexible
20 "yMMM" "Feb 2000" flexible
21 "yMMMM" "February 2000" flexible
22 "yMMMd" "Feb 29, 2000" flexible
23 "yMMMEd" "Tue, Feb 29, 2000" flexible
24 "GyMd" "2/29/2000 A" flexible
25 "GyMMMd" "Feb 29, 2000 AD" flexible
26 "GyMMMEd" "Tue, Feb 29, 2000 AD" flexible
27 "yM" "2/2000" flexible
28 "Md" "2/29" flexible
29 "MEd" "Tue, 2/29" flexible
30 "MMMd" "Feb 29" flexible
31 "MMMEd" "Tue, Feb 29" flexible
32 "MMMMd" "February 29" flexible
33 "GyMMM" "Feb 2000 AD" flexible
34 "yQQQ" "Q1 2000" flexible
35 "yQQQQ" "1st quarter 2000" flexible
36 "Gy" "2000 AD" flexible
37 "y" "2000" flexible
38 "M" "2" flexible
39 "MMM" "Feb" flexible
40 "d" "29" flexible
41 "Ed" "29 Tue" flexible
We can call info_date_style() in the console to view a similar table of
date styles with example output.
Formatting with the time_style argument
We can supply a preset time style to the time_style argument to separately
handle the time portion of the output. There are many time styles and all of
them can handle localization to any supported locale. Many of the time styles
are termed flexible time formats and this means that their output will adapt
to any locale provided. That feature makes the flexible time formats a
better option for locales other than "en" (the default locale).
The following table provides a listing of all time styles and their output
values (corresponding to an input time of 14:35:00). It is noted which of
these represent 12- or 24-hour time. Some of the flexible formats (those
that begin with "E") include the day of the week. Keep this in mind
when pairing such time_style values with a date_style so as to avoid
redundant or repeating information.
Time Style Output Notes
1 "iso" "14:35:00" ISO 8601, 24h
2 "iso-short" "14:35" ISO 8601, 24h
3 "h_m_s_p" "2:35:00 PM" 12h
4 "h_m_p" "2:35 PM" 12h
5 "h_p" "2 PM" 12h
6 "Hms" "14:35:00" flexible, 24h
7 "Hm" "14:35" flexible, 24h
8 "H" "14" flexible, 24h
9 "EHm" "Thu 14:35" flexible, 24h
10 "EHms" "Thu 14:35:00" flexible, 24h
11 "Hmsv" "14:35:00 GMT+00:00" flexible, 24h
12 "Hmv" "14:35 GMT+00:00" flexible, 24h
13 "hms" "2:35:00 PM" flexible, 12h
14 "hm" "2:35 PM" flexible, 12h
15 "h" "2 PM" flexible, 12h
16 "Ehm" "Thu 2:35 PM" flexible, 12h
17 "Ehms" "Thu 2:35:00 PM" flexible, 12h
18 "EBhms" "Thu 2:35:00 in the afternoon" flexible, 12h
19 "Bhms" "2:35:00 in the afternoon" flexible, 12h
20 "EBhm" "Thu 2:35 in the afternoon" flexible, 12h
21 "Bhm" "2:35 in the afternoon" flexible, 12h
22 "Bh" "2 in the afternoon" flexible, 12h
23 "hmsv" "2:35:00 PM GMT+00:00" flexible, 12h
24 "hmv" "2:35 PM GMT+00:00" flexible, 12h
25 "ms" "35:00" flexible
We can call info_time_style() in the console to view a similar table of
time styles with example output.
Formatting with a CLDR datetime pattern
We can use a CLDR datetime pattern with the format argument to create
a highly customized and locale-aware output. This is a character string that
consists of two types of elements:
Pattern fields, which repeat a specific pattern character one or more
times. These fields are replaced with date and time data when formatting.
The character sets of A-Z and a-z are reserved for use as pattern
characters.
Literal text, which is output verbatim when formatting. This can include:
Any characters outside the reserved character sets, including
spaces and punctuation.
Any text between single vertical quotes (e.g., 'text').
Two adjacent single vertical quotes (”), which represent a literal
single quote, either inside or outside quoted text.
The number of pattern fields is quite sizable so let's first look at how some
CLDR datetime patterns work. We'll use the datetime string
"2018-07-04T22:05:09.2358(America/Vancouver)" for all of the examples that
follow.
-
"mm/dd/y" -> "05/04/2018"
-
"EEEE, MMMM d, y" -> "Wednesday, July 4, 2018"
-
"MMM d E" -> "Jul 4 Wed"
-
"HH:mm" -> "22:05"
-
"h:mm a" -> "10:05 PM"
-
"EEEE, MMMM d, y 'at' h:mm a" -> "Wednesday, July 4, 2018 at 10:05 PM"
Here are the individual pattern fields:
Year
Calendar Year
This yields the calendar year, which is always numeric. In most cases the
length of the "y" field specifies the minimum number of digits to display,
zero-padded as necessary. More digits will be displayed if needed to show the
full year. There is an exception: "yy" gives use just the two low-order
digits of the year, zero-padded as necessary. For most use cases, "y" or
"yy" should be good enough.
Field Patterns Output
"y" "2018"
"yy" "18"
"yyy" to "yyyyyyyyy" "2018" to "000002018"
Year in the Week in Year Calendar
This is the year in 'Week of Year' based calendars in which the year
transition occurs on a week boundary. This may differ from calendar year
"y" near a year transition. This numeric year designation is used in
conjunction with pattern character "w" in the ISO year-week calendar as
defined by ISO 8601.
Field Patterns Output
"Y" "2018"
"YY" "18"
"YYY" to "YYYYYYYYY" "2018" to "000002018"
Quarter
Quarter of the Year: formatting and standalone versions
The quarter names are identified numerically, starting at 1 and ending at
4. Quarter names may vary along two axes: the width and the context. The
context is either 'formatting' (taken as a default), which the form used
within a complete date format string, or, 'standalone', the form for date
elements used independently (such as in calendar headers). The standalone
form may be used in any other date format that shares the same form of the
name. Here, the formatting form for quarters of the year consists of some run
of "Q" values whereas the standalone form uses "q".
Field Patterns Output Notes
"Q"/"q" "3" Numeric, one digit
"QQ"/"qq" "03" Numeric, two digits (zero padded)
"QQQ"/"qqq" "Q3" Abbreviated
"QQQQ"/"qqqq" "3rd quarter" Wide
"QQQQQ"/"qqqqq" "3" Narrow
Month
Month: formatting and standalone versions
The month names are identified numerically, starting at 1 and ending at
12. Month names may vary along two axes: the width and the context. The
context is either 'formatting' (taken as a default), which the form used
within a complete date format string, or, 'standalone', the form for date
elements used independently (such as in calendar headers). The standalone
form may be used in any other date format that shares the same form of the
name. Here, the formatting form for months consists of some run of "M"
values whereas the standalone form uses "L".
Field Patterns Output Notes
"M"/"L" "7" Numeric, minimum digits
"MM"/"LL" "07" Numeric, two digits (zero padded)
"MMM"/"LLL" "Jul" Abbreviated
"MMMM"/"LLLL" "July" Wide
"MMMMM"/"LLLLL" "J" Narrow
Week
Week of Year
Values calculated for the week of year range from 1 to 53. Week 1 for a
year is the first week that contains at least the specified minimum number of
days from that year. Weeks between week 1 of one year and week 1 of the
following year are numbered sequentially from 2 to 52 or 53 (if
needed).
There are two available field lengths. Both will display the week of year
value but the "ww" width will always show two digits (where weeks 1 to
9 are zero padded).
Field Patterns Output Notes
"w" "27" Minimum digits
"ww" "27" Two digits (zero padded)
Week of Month
The week of a month can range from 1 to 5. The first day of every month
always begins at week 1 and with every transition into the beginning of a
week, the week of month value is incremented by 1.
Field Pattern Output
"W" "1"
Day
Day of Month
The day of month value is always numeric and there are two available field
length choices in its formatting. Both will display the day of month value
but the "dd" formatting will always show two digits (where days 1 to 9
are zero padded).
Field Patterns Output Notes
"d" "4" Minimum digits
"dd" "04" Two digits, zero padded
Day of Year
The day of year value ranges from 1 (January 1) to either 365 or 366
(December 31), where the higher value of the range indicates that the year is
a leap year (29 days in February, instead of 28). The field length specifies
the minimum number of digits, with zero-padding as necessary.
Field Patterns Output Notes
"D" "185"
"DD" "185" Zero padded to minimum width of 2
"DDD" "185" Zero padded to minimum width of 3
Day of Week in Month
The day of week in month returns a numerical value indicating the number of
times a given weekday had occurred in the month (e.g., '2nd Monday in
March'). This conveniently resolves to predicable case structure where ranges
of day of the month values return predictable day of week in month values:
days 1 - 7 -> 1
days 8 - 14 -> 2
days 15 - 21 -> 3
days 22 - 28 -> 4
days 29 - 31 -> 5
Field Pattern Output
"F" "1"
Modified Julian Date
The modified version of the Julian date is obtained by subtracting
2,400,000.5 days from the Julian date (the number of days since January 1,
4713 BC). This essentially results in the number of days since midnight
November 17, 1858. There is a half day offset (unlike the Julian date, the
modified Julian date is referenced to midnight instead of noon).
Field Patterns Output
"g" to "ggggggggg" "58303" -> "000058303"
Weekday
Day of Week Name
The name of the day of week is offered in four different widths.
Field Patterns Output Notes
"E", "EE", or "EEE" "Wed" Abbreviated
"EEEE" "Wednesday" Wide
"EEEEE" "W" Narrow
"EEEEEE" "We" Short
Periods
AM/PM Period of Day
This denotes before noon and after noon time periods. May be upper or
lowercase depending on the locale and other options. The wide form may be
the same as the short form if the 'real' long form (e.g. 'ante meridiem') is
not customarily used. The narrow form must be unique, unlike some other
fields.
Field Patterns Output Notes
"a", "aa", or "aaa" "PM" Abbreviated
"aaaa" "PM" Wide
"aaaaa" "p" Narrow
AM/PM Period of Day Plus Noon and Midnight
Provide AM and PM as well as phrases for exactly noon and midnight. May be
upper or lowercase depending on the locale and other options. If the locale
doesn't have the notion of a unique 'noon' (i.e., 12:00), then the PM form
may be substituted. A similar behavior can occur for 'midnight' (00:00) and
the AM form. The narrow form must be unique, unlike some other fields.
(a) input_midnight: "2020-05-05T00:00:00"
(b) input_noon: "2020-05-05T12:00:00"
Field Patterns Output Notes
"b", "bb", or "bbb" (a) "midnight" Abbreviated
(b) "noon"
"bbbb" (a) "midnight" Wide
(b) "noon"
"bbbbb" (a) "mi" Narrow
(b) "n"
Flexible Day Periods
Flexible day periods denotes things like 'in the afternoon', 'in the
evening', etc., and the flexibility comes from a locale's language and
script. Each locale has an associated rule set that specifies when the day
periods start and end for that locale.
(a) input_morning: "2020-05-05T00:08:30"
(b) input_afternoon: "2020-05-05T14:00:00"
Field Patterns Output Notes
"B", "BB", or "BBB" (a) "in the morning" Abbreviated
(b) "in the afternoon"
"BBBB" (a) "in the morning" Wide
(b) "in the afternoon"
"BBBBB" (a) "in the morning" Narrow
(b) "in the afternoon"
Hours, Minutes, and Seconds
Hour 0-23
Hours from 0 to 23 are for a standard 24-hour clock cycle (midnight plus
1 minute is 00:01) when using "HH" (which is the more common width that
indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
Field Patterns Output Notes
"H" "8" Numeric, minimum digits
"HH" "08" Numeric, 2 digits (zero padded)
Hour 1-12
Hours from 1 to 12 are for a standard 12-hour clock cycle (midnight plus
1 minute is 12:01) when using "hh" (which is the more common width that
indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
Field Patterns Output Notes
"h" "8" Numeric, minimum digits
"hh" "08" Numeric, 2 digits (zero padded)
Hour 1-24
Using hours from 1 to 24 is a less common way to express a 24-hour clock
cycle (midnight plus 1 minute is 24:01) when using "kk" (which is the
more common width that indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
Field Patterns Output Notes
"k" "9" Numeric, minimum digits
"kk" "09" Numeric, 2 digits (zero padded)
Hour 0-11
Using hours from 0 to 11 is a less common way to express a 12-hour clock
cycle (midnight plus 1 minute is 00:01) when using "KK" (which is the
more common width that indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
Field Patterns Output Notes
"K" "7" Numeric, minimum digits
"KK" "07" Numeric, 2 digits (zero padded)
Minute
The minute of the hour which can be any number from 0 to 59. Use "m" to
show the minimum number of digits, or "mm" to always show two digits
(zero-padding, if necessary).
Field Patterns Output Notes
"m" "5" Numeric, minimum digits
"mm" "06" Numeric, 2 digits (zero padded)
Seconds
The second of the minute which can be any number from 0 to 59. Use "s"
to show the minimum number of digits, or "ss" to always show two digits
(zero-padding, if necessary).
Field Patterns Output Notes
"s" "9" Numeric, minimum digits
"ss" "09" Numeric, 2 digits (zero padded)
Fractional Second
The fractional second truncates (like other time fields) to the width
requested (i.e., count of letters). So using pattern "SSSS" will display
four digits past the decimal (which, incidentally, needs to be added manually
to the pattern).
Field Patterns Output
"S" to "SSSSSSSSS" "2" -> "235000000"
Milliseconds Elapsed in Day
There are 86,400,000 milliseconds in a day and the "A" pattern will provide
the whole number. The width can go up to nine digits with "AAAAAAAAA" and
these higher field widths will result in zero padding if necessary.
Using "2011-07-27T00:07:19.7223":
Field Patterns Output
"A" to "AAAAAAAAA" "439722" -> "000439722"
Era
The Era Designator
This provides the era name for the given date. The Gregorian calendar has two
eras: AD and BC. In the AD year numbering system, AD 1 is immediately
preceded by 1 BC, with nothing in between them (there was no year zero).
Field Patterns Output Notes
"G", "GG", or "GGG" "AD" Abbreviated
"GGGG" "Anno Domini" Wide
"GGGGG" "A" Narrow
Time Zones
TZ // Short and Long Specific non-Location Format
The short and long specific non-location formats for time zones are suggested
for displaying a time with a user friendly time zone name. Where the short
specific format is unavailable, it will fall back to the short localized GMT
format ("O"). Where the long specific format is unavailable, it will fall
back to the long localized GMT format ("OOOO").
Field Patterns Output Notes
"z", "zz", or "zzz" "PDT" Short Specific
"zzzz" "Pacific Daylight Time" Long Specific
TZ // Common UTC Offset Formats
The ISO8601 basic format with hours, minutes and optional seconds fields is
represented by "Z", "ZZ", or "ZZZ". The format is equivalent to RFC 822
zone format (when the optional seconds field is absent). This is equivalent
to the "xxxx" specifier. The field pattern "ZZZZ" represents the long
localized GMT format. This is equivalent to the "OOOO" specifier. Finally,
"ZZZZZ" pattern yields the ISO8601 extended format with hours, minutes and
optional seconds fields. The ISO8601 UTC indicator Z is used when local
time offset is 0. This is equivalent to the "XXXXX" specifier.
Field Patterns Output Notes
"Z", "ZZ", or "ZZZ" "-0700" ISO 8601 basic format
"ZZZZ" "GMT-7:00" Long localized GMT format
"ZZZZZ" "-07:00" ISO 8601 extended format
TZ // Short and Long Localized GMT Formats
The localized GMT formats come in two widths "O" (which removes the minutes
field if it's 0) and "OOOO" (which always contains the minutes field).
The use of the GMT indicator changes according to the locale.
Field Patterns Output Notes
"O" "GMT-7" Short localized GMT format
"OOOO" "GMT-07:00" Long localized GMT format
TZ // Short and Long Generic non-Location Formats
The generic non-location formats are useful for displaying a recurring wall
time (e.g., events, meetings) or anywhere people do not want to be overly
specific. Where either of these is unavailable, there is a fallback to the
generic location format ("VVVV"), then the short localized GMT format as
the final fallback.
Field Patterns Output Notes
"v" "PT" Short generic non-location format
"vvvv" "Pacific Time" Long generic non-location format
TZ // Short Time Zone IDs and Exemplar City Formats
These formats provide variations of the time zone ID and often include the
exemplar city. The widest of these formats, "VVVV", is useful for
populating a choice list for time zones, because it supports 1-to-1 name/zone
ID mapping and is more uniform than other text formats.
Field Patterns Output Notes
"V" "cavan" Short time zone ID
"VV" "America/Vancouver" Long time zone ID
"VVV" "Vancouver" The tz exemplar city
"VVVV" "Vancouver Time" Generic location format
TZ // ISO 8601 Formats with Z for +0000
The "X"-"XXX" field patterns represent valid ISO 8601 patterns for time
zone offsets in datetimes. The final two widths, "XXXX" and "XXXXX" allow
for optional seconds fields. The seconds field is not supported by the ISO
8601 specification. For all of these, the ISO 8601 UTC indicator Z is used
when the local time offset is 0.
Field Patterns Output Notes
"X" "-07" ISO 8601 basic format (h, optional m)
"XX" "-0700" ISO 8601 basic format (h & m)
"XXX" "-07:00" ISO 8601 extended format (h & m)
"XXXX" "-0700" ISO 8601 basic format (h & m, optional s)
"XXXXX" "-07:00" ISO 8601 extended format (h & m, optional s)
TZ // ISO 8601 Formats (no use of Z for +0000)
The "x"-"xxxxx" field patterns represent valid ISO 8601 patterns for time
zone offsets in datetimes. They are similar to the "X"-"XXXXX" field
patterns except that the ISO 8601 UTC indicator Z will not be used when
the local time offset is 0.
Field Patterns Output Notes
"x" "-07" ISO 8601 basic format (h, optional m)
"xx" "-0700" ISO 8601 basic format (h & m)
"xxx" "-07:00" ISO 8601 extended format (h & m)
"xxxx" "-0700" ISO 8601 basic format (h & m, optional s)
"xxxxx" "-07:00" ISO 8601 extended format (h & m, optional s)
Formatting with a strptime format code
Performing custom date/time formatting with the format argument can also
occur with a strptime format code. This works by constructing a string of
individual format codes representing formatted date and time elements. These
are all indicated with a leading %, literal characters are interpreted as
any characters not starting with a % character.
First off, let's look at a few format code combinations that work well
together as a strptime format. This will give us an intuition on how these
generally work. We'll use the datetime "2015-06-08 23:05:37.48" for all of
the examples that follow.
-
"%m/%d/%Y" -> "06/08/2015"
-
"%A, %B %e, %Y" -> "Monday, June 8, 2015"
-
"%b %e %a" -> "Jun 8 Mon"
-
"%H:%M" -> "23:05"
-
"%I:%M %p" -> "11:05 pm"
-
"%A, %B %e, %Y at %I:%M %p" -> "Monday, June 8, 2015 at 11:05 pm"
Here are the individual format codes for the date components:
-
"%a" -> "Mon" (abbreviated day of week name)
-
"%A" -> "Monday" (full day of week name)
-
"%w" -> "1" (day of week number in 0..6; Sunday is 0)
-
"%u" -> "1" (day of week number in 1..7; Monday is 1, Sunday 7)
-
"%y" -> "15" (abbreviated year, using the final two digits)
-
"%Y" -> "2015" (full year)
-
"%b" -> "Jun" (abbreviated month name)
-
"%B" -> "June" (full month name)
-
"%m" -> "06" (month number)
-
"%d" -> "08" (day number, zero-padded)
-
"%e" -> "8" (day number without zero padding)
-
"%j" -> "159" (day of the year, always zero-padded)
-
"%W" -> "23" (week number for the year, always zero-padded)
-
"%V" -> "24" (week number for the year, following the ISO 8601
standard)
-
"%C" -> "20" (the century number)
Here are the individual format codes for the time components:
-
"%H" -> "23" (24h hour)
-
"%I" -> "11" (12h hour)
-
"%M" -> "05" (minute)
-
"%S" -> "37" (second)
-
"%OS3" -> "37.480" (seconds with decimals; 3 decimal places here)
-
%p -> "pm" (AM or PM indicator)
Here are some extra formats that you may find useful:
-
"%z" -> "+0000" (signed time zone offset, here using UTC)
-
"%F" -> "2015-06-08" (the date in the ISO 8601 date format)
-
"%%" -> "%" (the literal "%" character, in case you need it)
Examples
Let's create a character vector of datetime values in the ISO-8601 format
for the next few examples:
str_vals <- c("2022-06-13 18:36", "2019-01-25 01:08", NA)
Using vec_fmt_datetime() with different date_style and time_style
options (here, date_style = "yMMMEd" and time_style = "Hm") will result
in a character vector of formatted datetime values. Any NA values remain as
NA values. The rendering context will be autodetected unless specified in
the output argument (here, it is of the "plain" output type).
vec_fmt_datetime(
str_vals,
date_style = "yMMMEd",
time_style = "Hm"
)
#> [1] "Mon, Jun 13, 2022 18:36" "Fri, Jan 25, 2019 01:08" NA
We can choose from any of 41 different date styles and 25 time formatting
styles. Many of these styles are flexible, meaning that the structure of the
format will adapt to different locales. Let's use a combination of the
"yMMMd" and "hms" date and time styles to demonstrate this (first in the
default locale of "en"):
vec_fmt_datetime(
str_vals,
date_style = "yMMMd",
time_style = "hms"
)
#> [1] "Jun 13, 2022 6:36:00 PM" "Jan 25, 2019 1:08:00 AM" NA
Let's perform the same type of formatting in the Italian ("it") locale:
vec_fmt_datetime(
str_vals,
date_style = "yMMMd",
time_style = "hms",
locale = "it"
)
#> [1] "13 giu 2022 6:36:00 PM" "25 gen 2019 1:08:00 AM" NA
We can always use info_date_style() or info_time_style() to call up info
tables that serve as handy references to all of the date_style and
time_style options.
It's possible to supply our own time formatting pattern within the format
argument. One way is with a CLDR pattern, which is locale-aware:
vec_fmt_datetime(str_vals, format = "EEEE, MMMM d, y, h:mm a")
#> [1] "Monday, June 13, 2022, 06:36 PM"
#> [2] "Friday, January 25, 2019, 01:08 AM"
#> [3] NA
By using the locale argument, this can be formatted as Dutch datetime
values:
vec_fmt_datetime(
str_vals,
format = "EEEE, MMMM d, y, h:mm a",
locale = "nl"
)
#> [1] "maandag, juni 13, 2022, 6:36 p.m."
#> [2] "vrijdag, januari 25, 2019, 1:08 a.m."
#> [3] NA
It's also possible to use a strptime format code with format (however,
any value provided to locale will be ignored).
vec_fmt_datetime(str_vals, format = "%A, %B %e, %Y at %I:%M %p")
#> [1] "Monday, June 13, 2022 at 06:36 pm"
#> [2] "Friday, January 25, 2019 at 01:08 am"
#> [3] NA
As a last example, one can wrap the datetime values in a pattern with the
pattern argument. Note here that NA values won't have the pattern
applied.
vec_fmt_datetime(
str_vals,
sep = " at ",
pattern = "Date and Time: {x}"
)
#> [1] "Date and Time: 2022-06-13 at 18:36:00"
#> [2] "Date and Time: 2019-01-25 at 01:08:00"
#> [3] NA
Function ID
15-15
Function Introduced
v0.7.0 (Aug 25, 2022)
See Also
The variant function intended for formatting gt table data:
fmt_datetime().
Other vector formatting functions:
vec_fmt_bytes(),
vec_fmt_currency(),
vec_fmt_date(),
vec_fmt_duration(),
vec_fmt_engineering(),
vec_fmt_fraction(),
vec_fmt_index(),
vec_fmt_integer(),
vec_fmt_markdown(),
vec_fmt_number(),
vec_fmt_partsper(),
vec_fmt_percent(),
vec_fmt_roman(),
vec_fmt_scientific(),
vec_fmt_spelled_num(),
vec_fmt_time()
rstudio/gt documentation built on Dec. 2, 2024, 11:05 a.m.
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| vec_fmt_datetime | R Documentation |
Format a vector as datetime values
Description
Format values in a vector to datetime values using either presets for the
date and time components or a formatting directive (this can either use a
CLDR datetime pattern or strptime formatting). Input can be in the form
of POSIXct (i.e., datetimes), the Date type, or character (must be in
the ISO 8601 form of YYYY-MM-DD HH:MM:SS or YYYY-MM-DD).
Usage
vec_fmt_datetime(
x,
date_style = "iso",
time_style = "iso",
sep = " ",
format = NULL,
tz = NULL,
pattern = "{x}",
locale = NULL,
output = c("auto", "plain", "html", "latex", "rtf", "word")
)
Arguments
x |
The input vector
This is the input vector that will undergo transformation to a character vector of the same length. Values within the vector will be formatted. |
date_style |
Predefined style for dates
The date style to use. By default this is the short name |
time_style |
Predefined style for times
The time style to use. By default this is the short name |
sep |
Separator between date and time components
The separator string to use between the date and time components. By
default, this is a single space character ( |
format |
Date/time formatting string
An optional formatting string used for generating custom dates/times. If
used then the arguments governing preset styles ( |
tz |
Time zone
The time zone for printing dates/times (i.e., the output). The
default of |
pattern |
Specification of the formatting pattern
A formatting pattern that allows for decoration of the formatted value. The
formatted value is represented by the |
locale |
Locale identifier
An optional locale identifier that can be used for formatting values
according to the locale's rules. Examples include |
output |
Output format
The output style of the resulting character vector. This can either be
|
Value
A character vector.
Formatting with the date_style argument
We can supply a preset date style to the date_style argument to separately
handle the date portion of the output. The date styles are numerous and can
handle localization to any supported locale. A large segment of date styles
are termed flexible date formats and this means that their output will adapt
to any locale provided. That feature makes the flexible date formats a
better option for locales other than "en" (the default locale).
The following table provides a listing of all date styles and their output
values (corresponding to an input date of 2000-02-29).
| Date Style | Output | Notes | |
| 1 | "iso" | "2000-02-29" | ISO 8601 |
| 2 | "wday_month_day_year" | "Tuesday, February 29, 2000" | |
| 3 | "wd_m_day_year" | "Tue, Feb 29, 2000" | |
| 4 | "wday_day_month_year" | "Tuesday 29 February 2000" | |
| 5 | "month_day_year" | "February 29, 2000" | |
| 6 | "m_day_year" | "Feb 29, 2000" | |
| 7 | "day_m_year" | "29 Feb 2000" | |
| 8 | "day_month_year" | "29 February 2000" | |
| 9 | "day_month" | "29 February" | |
| 10 | "day_m" | "29 Feb" | |
| 11 | "year" | "2000" | |
| 12 | "month" | "February" | |
| 13 | "day" | "29" | |
| 14 | "year.mn.day" | "2000/02/29" | |
| 15 | "y.mn.day" | "00/02/29" | |
| 16 | "year_week" | "2000-W09" | |
| 17 | "year_quarter" | "2000-Q1" | |
| 18 | "yMd" | "2/29/2000" | flexible |
| 19 | "yMEd" | "Tue, 2/29/2000" | flexible |
| 20 | "yMMM" | "Feb 2000" | flexible |
| 21 | "yMMMM" | "February 2000" | flexible |
| 22 | "yMMMd" | "Feb 29, 2000" | flexible |
| 23 | "yMMMEd" | "Tue, Feb 29, 2000" | flexible |
| 24 | "GyMd" | "2/29/2000 A" | flexible |
| 25 | "GyMMMd" | "Feb 29, 2000 AD" | flexible |
| 26 | "GyMMMEd" | "Tue, Feb 29, 2000 AD" | flexible |
| 27 | "yM" | "2/2000" | flexible |
| 28 | "Md" | "2/29" | flexible |
| 29 | "MEd" | "Tue, 2/29" | flexible |
| 30 | "MMMd" | "Feb 29" | flexible |
| 31 | "MMMEd" | "Tue, Feb 29" | flexible |
| 32 | "MMMMd" | "February 29" | flexible |
| 33 | "GyMMM" | "Feb 2000 AD" | flexible |
| 34 | "yQQQ" | "Q1 2000" | flexible |
| 35 | "yQQQQ" | "1st quarter 2000" | flexible |
| 36 | "Gy" | "2000 AD" | flexible |
| 37 | "y" | "2000" | flexible |
| 38 | "M" | "2" | flexible |
| 39 | "MMM" | "Feb" | flexible |
| 40 | "d" | "29" | flexible |
| 41 | "Ed" | "29 Tue" | flexible |
We can call info_date_style() in the console to view a similar table of
date styles with example output.
Formatting with the time_style argument
We can supply a preset time style to the time_style argument to separately
handle the time portion of the output. There are many time styles and all of
them can handle localization to any supported locale. Many of the time styles
are termed flexible time formats and this means that their output will adapt
to any locale provided. That feature makes the flexible time formats a
better option for locales other than "en" (the default locale).
The following table provides a listing of all time styles and their output
values (corresponding to an input time of 14:35:00). It is noted which of
these represent 12- or 24-hour time. Some of the flexible formats (those
that begin with "E") include the day of the week. Keep this in mind
when pairing such time_style values with a date_style so as to avoid
redundant or repeating information.
| Time Style | Output | Notes | |
| 1 | "iso" | "14:35:00" | ISO 8601, 24h |
| 2 | "iso-short" | "14:35" | ISO 8601, 24h |
| 3 | "h_m_s_p" | "2:35:00 PM" | 12h |
| 4 | "h_m_p" | "2:35 PM" | 12h |
| 5 | "h_p" | "2 PM" | 12h |
| 6 | "Hms" | "14:35:00" | flexible, 24h |
| 7 | "Hm" | "14:35" | flexible, 24h |
| 8 | "H" | "14" | flexible, 24h |
| 9 | "EHm" | "Thu 14:35" | flexible, 24h |
| 10 | "EHms" | "Thu 14:35:00" | flexible, 24h |
| 11 | "Hmsv" | "14:35:00 GMT+00:00" | flexible, 24h |
| 12 | "Hmv" | "14:35 GMT+00:00" | flexible, 24h |
| 13 | "hms" | "2:35:00 PM" | flexible, 12h |
| 14 | "hm" | "2:35 PM" | flexible, 12h |
| 15 | "h" | "2 PM" | flexible, 12h |
| 16 | "Ehm" | "Thu 2:35 PM" | flexible, 12h |
| 17 | "Ehms" | "Thu 2:35:00 PM" | flexible, 12h |
| 18 | "EBhms" | "Thu 2:35:00 in the afternoon" | flexible, 12h |
| 19 | "Bhms" | "2:35:00 in the afternoon" | flexible, 12h |
| 20 | "EBhm" | "Thu 2:35 in the afternoon" | flexible, 12h |
| 21 | "Bhm" | "2:35 in the afternoon" | flexible, 12h |
| 22 | "Bh" | "2 in the afternoon" | flexible, 12h |
| 23 | "hmsv" | "2:35:00 PM GMT+00:00" | flexible, 12h |
| 24 | "hmv" | "2:35 PM GMT+00:00" | flexible, 12h |
| 25 | "ms" | "35:00" | flexible |
We can call info_time_style() in the console to view a similar table of
time styles with example output.
Formatting with a CLDR datetime pattern
We can use a CLDR datetime pattern with the format argument to create
a highly customized and locale-aware output. This is a character string that
consists of two types of elements:
Pattern fields, which repeat a specific pattern character one or more times. These fields are replaced with date and time data when formatting. The character sets of
A-Zanda-zare reserved for use as pattern characters.Literal text, which is output verbatim when formatting. This can include:
Any characters outside the reserved character sets, including spaces and punctuation.
Any text between single vertical quotes (e.g.,
'text').Two adjacent single vertical quotes (”), which represent a literal single quote, either inside or outside quoted text.
The number of pattern fields is quite sizable so let's first look at how some
CLDR datetime patterns work. We'll use the datetime string
"2018-07-04T22:05:09.2358(America/Vancouver)" for all of the examples that
follow.
-
"mm/dd/y"->"05/04/2018" -
"EEEE, MMMM d, y"->"Wednesday, July 4, 2018" -
"MMM d E"->"Jul 4 Wed" -
"HH:mm"->"22:05" -
"h:mm a"->"10:05 PM" -
"EEEE, MMMM d, y 'at' h:mm a"->"Wednesday, July 4, 2018 at 10:05 PM"
Here are the individual pattern fields:
Year
Calendar Year
This yields the calendar year, which is always numeric. In most cases the
length of the "y" field specifies the minimum number of digits to display,
zero-padded as necessary. More digits will be displayed if needed to show the
full year. There is an exception: "yy" gives use just the two low-order
digits of the year, zero-padded as necessary. For most use cases, "y" or
"yy" should be good enough.
| Field Patterns | Output |
"y" | "2018" |
"yy" | "18" |
"yyy" to "yyyyyyyyy" | "2018" to "000002018" |
Year in the Week in Year Calendar
This is the year in 'Week of Year' based calendars in which the year
transition occurs on a week boundary. This may differ from calendar year
"y" near a year transition. This numeric year designation is used in
conjunction with pattern character "w" in the ISO year-week calendar as
defined by ISO 8601.
| Field Patterns | Output |
"Y" | "2018" |
"YY" | "18" |
"YYY" to "YYYYYYYYY" | "2018" to "000002018" |
Quarter
Quarter of the Year: formatting and standalone versions
The quarter names are identified numerically, starting at 1 and ending at
4. Quarter names may vary along two axes: the width and the context. The
context is either 'formatting' (taken as a default), which the form used
within a complete date format string, or, 'standalone', the form for date
elements used independently (such as in calendar headers). The standalone
form may be used in any other date format that shares the same form of the
name. Here, the formatting form for quarters of the year consists of some run
of "Q" values whereas the standalone form uses "q".
| Field Patterns | Output | Notes |
"Q"/"q" | "3" | Numeric, one digit |
"QQ"/"qq" | "03" | Numeric, two digits (zero padded) |
"QQQ"/"qqq" | "Q3" | Abbreviated |
"QQQQ"/"qqqq" | "3rd quarter" | Wide |
"QQQQQ"/"qqqqq" | "3" | Narrow |
Month
Month: formatting and standalone versions
The month names are identified numerically, starting at 1 and ending at
12. Month names may vary along two axes: the width and the context. The
context is either 'formatting' (taken as a default), which the form used
within a complete date format string, or, 'standalone', the form for date
elements used independently (such as in calendar headers). The standalone
form may be used in any other date format that shares the same form of the
name. Here, the formatting form for months consists of some run of "M"
values whereas the standalone form uses "L".
| Field Patterns | Output | Notes |
"M"/"L" | "7" | Numeric, minimum digits |
"MM"/"LL" | "07" | Numeric, two digits (zero padded) |
"MMM"/"LLL" | "Jul" | Abbreviated |
"MMMM"/"LLLL" | "July" | Wide |
"MMMMM"/"LLLLL" | "J" | Narrow |
Week
Week of Year
Values calculated for the week of year range from 1 to 53. Week 1 for a
year is the first week that contains at least the specified minimum number of
days from that year. Weeks between week 1 of one year and week 1 of the
following year are numbered sequentially from 2 to 52 or 53 (if
needed).
There are two available field lengths. Both will display the week of year
value but the "ww" width will always show two digits (where weeks 1 to
9 are zero padded).
| Field Patterns | Output | Notes |
"w" | "27" | Minimum digits |
"ww" | "27" | Two digits (zero padded) |
Week of Month
The week of a month can range from 1 to 5. The first day of every month
always begins at week 1 and with every transition into the beginning of a
week, the week of month value is incremented by 1.
| Field Pattern | Output |
"W" | "1" |
Day
Day of Month
The day of month value is always numeric and there are two available field
length choices in its formatting. Both will display the day of month value
but the "dd" formatting will always show two digits (where days 1 to 9
are zero padded).
| Field Patterns | Output | Notes |
"d" | "4" | Minimum digits |
"dd" | "04" | Two digits, zero padded |
Day of Year
The day of year value ranges from 1 (January 1) to either 365 or 366
(December 31), where the higher value of the range indicates that the year is
a leap year (29 days in February, instead of 28). The field length specifies
the minimum number of digits, with zero-padding as necessary.
| Field Patterns | Output | Notes |
"D" | "185" | |
"DD" | "185" | Zero padded to minimum width of 2 |
"DDD" | "185" | Zero padded to minimum width of 3 |
Day of Week in Month
The day of week in month returns a numerical value indicating the number of times a given weekday had occurred in the month (e.g., '2nd Monday in March'). This conveniently resolves to predicable case structure where ranges of day of the month values return predictable day of week in month values:
days
1-7->1days
8-14->2days
15-21->3days
22-28->4days
29-31->5
| Field Pattern | Output |
"F" | "1" |
Modified Julian Date
The modified version of the Julian date is obtained by subtracting 2,400,000.5 days from the Julian date (the number of days since January 1, 4713 BC). This essentially results in the number of days since midnight November 17, 1858. There is a half day offset (unlike the Julian date, the modified Julian date is referenced to midnight instead of noon).
| Field Patterns | Output |
"g" to "ggggggggg" | "58303" -> "000058303" |
Weekday
Day of Week Name
The name of the day of week is offered in four different widths.
| Field Patterns | Output | Notes |
"E", "EE", or "EEE" | "Wed" | Abbreviated |
"EEEE" | "Wednesday" | Wide |
"EEEEE" | "W" | Narrow |
"EEEEEE" | "We" | Short |
Periods
AM/PM Period of Day
This denotes before noon and after noon time periods. May be upper or lowercase depending on the locale and other options. The wide form may be the same as the short form if the 'real' long form (e.g. 'ante meridiem') is not customarily used. The narrow form must be unique, unlike some other fields.
| Field Patterns | Output | Notes |
"a", "aa", or "aaa" | "PM" | Abbreviated |
"aaaa" | "PM" | Wide |
"aaaaa" | "p" | Narrow |
AM/PM Period of Day Plus Noon and Midnight
Provide AM and PM as well as phrases for exactly noon and midnight. May be upper or lowercase depending on the locale and other options. If the locale doesn't have the notion of a unique 'noon' (i.e., 12:00), then the PM form may be substituted. A similar behavior can occur for 'midnight' (00:00) and the AM form. The narrow form must be unique, unlike some other fields.
(a) input_midnight: "2020-05-05T00:00:00"
(b) input_noon: "2020-05-05T12:00:00"
| Field Patterns | Output | Notes |
"b", "bb", or "bbb" | (a) "midnight" | Abbreviated |
(b) "noon" | ||
"bbbb" | (a) "midnight" | Wide |
(b) "noon" | ||
"bbbbb" | (a) "mi" | Narrow |
(b) "n" | ||
Flexible Day Periods
Flexible day periods denotes things like 'in the afternoon', 'in the evening', etc., and the flexibility comes from a locale's language and script. Each locale has an associated rule set that specifies when the day periods start and end for that locale.
(a) input_morning: "2020-05-05T00:08:30"
(b) input_afternoon: "2020-05-05T14:00:00"
| Field Patterns | Output | Notes |
"B", "BB", or "BBB" | (a) "in the morning" | Abbreviated |
(b) "in the afternoon" | ||
"BBBB" | (a) "in the morning" | Wide |
(b) "in the afternoon" | ||
"BBBBB" | (a) "in the morning" | Narrow |
(b) "in the afternoon" | ||
Hours, Minutes, and Seconds
Hour 0-23
Hours from 0 to 23 are for a standard 24-hour clock cycle (midnight plus
1 minute is 00:01) when using "HH" (which is the more common width that
indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
| Field Patterns | Output | Notes |
"H" | "8" | Numeric, minimum digits |
"HH" | "08" | Numeric, 2 digits (zero padded) |
Hour 1-12
Hours from 1 to 12 are for a standard 12-hour clock cycle (midnight plus
1 minute is 12:01) when using "hh" (which is the more common width that
indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
| Field Patterns | Output | Notes |
"h" | "8" | Numeric, minimum digits |
"hh" | "08" | Numeric, 2 digits (zero padded) |
Hour 1-24
Using hours from 1 to 24 is a less common way to express a 24-hour clock
cycle (midnight plus 1 minute is 24:01) when using "kk" (which is the
more common width that indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
| Field Patterns | Output | Notes |
"k" | "9" | Numeric, minimum digits |
"kk" | "09" | Numeric, 2 digits (zero padded) |
Hour 0-11
Using hours from 0 to 11 is a less common way to express a 12-hour clock
cycle (midnight plus 1 minute is 00:01) when using "KK" (which is the
more common width that indicates zero-padding to 2 digits).
Using "2015-08-01T08:35:09":
| Field Patterns | Output | Notes |
"K" | "7" | Numeric, minimum digits |
"KK" | "07" | Numeric, 2 digits (zero padded) |
Minute
The minute of the hour which can be any number from 0 to 59. Use "m" to
show the minimum number of digits, or "mm" to always show two digits
(zero-padding, if necessary).
| Field Patterns | Output | Notes |
"m" | "5" | Numeric, minimum digits |
"mm" | "06" | Numeric, 2 digits (zero padded) |
Seconds
The second of the minute which can be any number from 0 to 59. Use "s"
to show the minimum number of digits, or "ss" to always show two digits
(zero-padding, if necessary).
| Field Patterns | Output | Notes |
"s" | "9" | Numeric, minimum digits |
"ss" | "09" | Numeric, 2 digits (zero padded) |
Fractional Second
The fractional second truncates (like other time fields) to the width
requested (i.e., count of letters). So using pattern "SSSS" will display
four digits past the decimal (which, incidentally, needs to be added manually
to the pattern).
| Field Patterns | Output |
"S" to "SSSSSSSSS" | "2" -> "235000000" |
Milliseconds Elapsed in Day
There are 86,400,000 milliseconds in a day and the "A" pattern will provide
the whole number. The width can go up to nine digits with "AAAAAAAAA" and
these higher field widths will result in zero padding if necessary.
Using "2011-07-27T00:07:19.7223":
| Field Patterns | Output |
"A" to "AAAAAAAAA" | "439722" -> "000439722" |
Era
The Era Designator
This provides the era name for the given date. The Gregorian calendar has two eras: AD and BC. In the AD year numbering system, AD 1 is immediately preceded by 1 BC, with nothing in between them (there was no year zero).
| Field Patterns | Output | Notes |
"G", "GG", or "GGG" | "AD" | Abbreviated |
"GGGG" | "Anno Domini" | Wide |
"GGGGG" | "A" | Narrow |
Time Zones
TZ // Short and Long Specific non-Location Format
The short and long specific non-location formats for time zones are suggested
for displaying a time with a user friendly time zone name. Where the short
specific format is unavailable, it will fall back to the short localized GMT
format ("O"). Where the long specific format is unavailable, it will fall
back to the long localized GMT format ("OOOO").
| Field Patterns | Output | Notes |
"z", "zz", or "zzz" | "PDT" | Short Specific |
"zzzz" | "Pacific Daylight Time" | Long Specific |
TZ // Common UTC Offset Formats
The ISO8601 basic format with hours, minutes and optional seconds fields is
represented by "Z", "ZZ", or "ZZZ". The format is equivalent to RFC 822
zone format (when the optional seconds field is absent). This is equivalent
to the "xxxx" specifier. The field pattern "ZZZZ" represents the long
localized GMT format. This is equivalent to the "OOOO" specifier. Finally,
"ZZZZZ" pattern yields the ISO8601 extended format with hours, minutes and
optional seconds fields. The ISO8601 UTC indicator Z is used when local
time offset is 0. This is equivalent to the "XXXXX" specifier.
| Field Patterns | Output | Notes |
"Z", "ZZ", or "ZZZ" | "-0700" | ISO 8601 basic format |
"ZZZZ" | "GMT-7:00" | Long localized GMT format |
"ZZZZZ" | "-07:00" | ISO 8601 extended format |
TZ // Short and Long Localized GMT Formats
The localized GMT formats come in two widths "O" (which removes the minutes
field if it's 0) and "OOOO" (which always contains the minutes field).
The use of the GMT indicator changes according to the locale.
| Field Patterns | Output | Notes |
"O" | "GMT-7" | Short localized GMT format |
"OOOO" | "GMT-07:00" | Long localized GMT format |
TZ // Short and Long Generic non-Location Formats
The generic non-location formats are useful for displaying a recurring wall
time (e.g., events, meetings) or anywhere people do not want to be overly
specific. Where either of these is unavailable, there is a fallback to the
generic location format ("VVVV"), then the short localized GMT format as
the final fallback.
| Field Patterns | Output | Notes |
"v" | "PT" | Short generic non-location format |
"vvvv" | "Pacific Time" | Long generic non-location format |
TZ // Short Time Zone IDs and Exemplar City Formats
These formats provide variations of the time zone ID and often include the
exemplar city. The widest of these formats, "VVVV", is useful for
populating a choice list for time zones, because it supports 1-to-1 name/zone
ID mapping and is more uniform than other text formats.
| Field Patterns | Output | Notes |
"V" | "cavan" | Short time zone ID |
"VV" | "America/Vancouver" | Long time zone ID |
"VVV" | "Vancouver" | The tz exemplar city |
"VVVV" | "Vancouver Time" | Generic location format |
TZ // ISO 8601 Formats with Z for +0000
The "X"-"XXX" field patterns represent valid ISO 8601 patterns for time
zone offsets in datetimes. The final two widths, "XXXX" and "XXXXX" allow
for optional seconds fields. The seconds field is not supported by the ISO
8601 specification. For all of these, the ISO 8601 UTC indicator Z is used
when the local time offset is 0.
| Field Patterns | Output | Notes |
"X" | "-07" | ISO 8601 basic format (h, optional m) |
"XX" | "-0700" | ISO 8601 basic format (h & m) |
"XXX" | "-07:00" | ISO 8601 extended format (h & m) |
"XXXX" | "-0700" | ISO 8601 basic format (h & m, optional s) |
"XXXXX" | "-07:00" | ISO 8601 extended format (h & m, optional s) |
TZ // ISO 8601 Formats (no use of Z for +0000)
The "x"-"xxxxx" field patterns represent valid ISO 8601 patterns for time
zone offsets in datetimes. They are similar to the "X"-"XXXXX" field
patterns except that the ISO 8601 UTC indicator Z will not be used when
the local time offset is 0.
| Field Patterns | Output | Notes |
"x" | "-07" | ISO 8601 basic format (h, optional m) |
"xx" | "-0700" | ISO 8601 basic format (h & m) |
"xxx" | "-07:00" | ISO 8601 extended format (h & m) |
"xxxx" | "-0700" | ISO 8601 basic format (h & m, optional s) |
"xxxxx" | "-07:00" | ISO 8601 extended format (h & m, optional s) |
Formatting with a strptime format code
Performing custom date/time formatting with the format argument can also
occur with a strptime format code. This works by constructing a string of
individual format codes representing formatted date and time elements. These
are all indicated with a leading %, literal characters are interpreted as
any characters not starting with a % character.
First off, let's look at a few format code combinations that work well
together as a strptime format. This will give us an intuition on how these
generally work. We'll use the datetime "2015-06-08 23:05:37.48" for all of
the examples that follow.
-
"%m/%d/%Y"->"06/08/2015" -
"%A, %B %e, %Y"->"Monday, June 8, 2015" -
"%b %e %a"->"Jun 8 Mon" -
"%H:%M"->"23:05" -
"%I:%M %p"->"11:05 pm" -
"%A, %B %e, %Y at %I:%M %p"->"Monday, June 8, 2015 at 11:05 pm"
Here are the individual format codes for the date components:
-
"%a"->"Mon"(abbreviated day of week name) -
"%A"->"Monday"(full day of week name) -
"%w"->"1"(day of week number in0..6; Sunday is0) -
"%u"->"1"(day of week number in1..7; Monday is1, Sunday7) -
"%y"->"15"(abbreviated year, using the final two digits) -
"%Y"->"2015"(full year) -
"%b"->"Jun"(abbreviated month name) -
"%B"->"June"(full month name) -
"%m"->"06"(month number) -
"%d"->"08"(day number, zero-padded) -
"%e"->"8"(day number without zero padding) -
"%j"->"159"(day of the year, always zero-padded) -
"%W"->"23"(week number for the year, always zero-padded) -
"%V"->"24"(week number for the year, following the ISO 8601 standard) -
"%C"->"20"(the century number)
Here are the individual format codes for the time components:
-
"%H"->"23"(24h hour) -
"%I"->"11"(12h hour) -
"%M"->"05"(minute) -
"%S"->"37"(second) -
"%OS3"->"37.480"(seconds with decimals;3decimal places here) -
%p->"pm"(AM or PM indicator)
Here are some extra formats that you may find useful:
-
"%z"->"+0000"(signed time zone offset, here using UTC) -
"%F"->"2015-06-08"(the date in the ISO 8601 date format) -
"%%"->"%"(the literal "%" character, in case you need it)
Examples
Let's create a character vector of datetime values in the ISO-8601 format for the next few examples:
str_vals <- c("2022-06-13 18:36", "2019-01-25 01:08", NA)
Using vec_fmt_datetime() with different date_style and time_style
options (here, date_style = "yMMMEd" and time_style = "Hm") will result
in a character vector of formatted datetime values. Any NA values remain as
NA values. The rendering context will be autodetected unless specified in
the output argument (here, it is of the "plain" output type).
vec_fmt_datetime( str_vals, date_style = "yMMMEd", time_style = "Hm" )
#> [1] "Mon, Jun 13, 2022 18:36" "Fri, Jan 25, 2019 01:08" NA
We can choose from any of 41 different date styles and 25 time formatting
styles. Many of these styles are flexible, meaning that the structure of the
format will adapt to different locales. Let's use a combination of the
"yMMMd" and "hms" date and time styles to demonstrate this (first in the
default locale of "en"):
vec_fmt_datetime( str_vals, date_style = "yMMMd", time_style = "hms" )
#> [1] "Jun 13, 2022 6:36:00 PM" "Jan 25, 2019 1:08:00 AM" NA
Let's perform the same type of formatting in the Italian ("it") locale:
vec_fmt_datetime( str_vals, date_style = "yMMMd", time_style = "hms", locale = "it" )
#> [1] "13 giu 2022 6:36:00 PM" "25 gen 2019 1:08:00 AM" NA
We can always use info_date_style() or info_time_style() to call up info
tables that serve as handy references to all of the date_style and
time_style options.
It's possible to supply our own time formatting pattern within the format
argument. One way is with a CLDR pattern, which is locale-aware:
vec_fmt_datetime(str_vals, format = "EEEE, MMMM d, y, h:mm a")
#> [1] "Monday, June 13, 2022, 06:36 PM" #> [2] "Friday, January 25, 2019, 01:08 AM" #> [3] NA
By using the locale argument, this can be formatted as Dutch datetime
values:
vec_fmt_datetime( str_vals, format = "EEEE, MMMM d, y, h:mm a", locale = "nl" )
#> [1] "maandag, juni 13, 2022, 6:36 p.m." #> [2] "vrijdag, januari 25, 2019, 1:08 a.m." #> [3] NA
It's also possible to use a strptime format code with format (however,
any value provided to locale will be ignored).
vec_fmt_datetime(str_vals, format = "%A, %B %e, %Y at %I:%M %p")
#> [1] "Monday, June 13, 2022 at 06:36 pm" #> [2] "Friday, January 25, 2019 at 01:08 am" #> [3] NA
As a last example, one can wrap the datetime values in a pattern with the
pattern argument. Note here that NA values won't have the pattern
applied.
vec_fmt_datetime(
str_vals,
sep = " at ",
pattern = "Date and Time: {x}"
)
#> [1] "Date and Time: 2022-06-13 at 18:36:00" #> [2] "Date and Time: 2019-01-25 at 01:08:00" #> [3] NA
Function ID
15-15
Function Introduced
v0.7.0 (Aug 25, 2022)
See Also
The variant function intended for formatting gt table data:
fmt_datetime().
Other vector formatting functions:
vec_fmt_bytes(),
vec_fmt_currency(),
vec_fmt_date(),
vec_fmt_duration(),
vec_fmt_engineering(),
vec_fmt_fraction(),
vec_fmt_index(),
vec_fmt_integer(),
vec_fmt_markdown(),
vec_fmt_number(),
vec_fmt_partsper(),
vec_fmt_percent(),
vec_fmt_roman(),
vec_fmt_scientific(),
vec_fmt_spelled_num(),
vec_fmt_time()
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