calendar-julian: Julian counts and calendar atoms

In timeDate: Rmetrics - Chronological and Calendar Objects

Julian counts and calendar atoms

Description

Returns Julian day counts, date/time atoms from a "timeDate" object, and extracts month atoms from a "timeDate" object.

Usage

## S3 method for class 'timeDate'
julian(x, origin = timeDate("1970-01-01"), 
       units = c("auto", "secs", "mins", "hours", "days", "weeks"), 
       zone = NULL, FinCenter = NULL, ...)

## S4 method for signature 'timeDate'
atoms(x, ...)

## S3 method for class 'timeDate'
months(x, abbreviate = FALSE)

## S3 method for class 'timeDate'
weekdays(x, abbreviate = FALSE)

## S3 method for class 'timeDate'
quarters(x, abbreviate)

## S4 method for signature 'timeDate'
x$name

Arguments

x	an object of class "timeDate".
origin	a length-one object inheriting from class "timeDate" setting the origin for the julian counter.
units	a character string denoting the date/time units in which the results are desired.
zone	the time zone or financial center where the data were recorded.
FinCenter	a character string with the location of the financial center named as "continent/city".
abbreviate	currently not used.
name	one of year, month, day, hour, minute, second, wday (or weekday), wday0 (or weekday0), and quarter. Completion is available in interactive sessions.
...	arguments passed to other methods.

Details

Generic functions to extract properties of "timeDate" objects. julian and months are generics from base R, while atoms is a generic defined in this package.

julian extracts the number of days since origin (can be fractional), see also julian.

atoms extracts the calendar atoms from a "timeDate" object, i.e., the year, month, day, and optionally, hour, minute and second. The result is a data frame with the financial center in atrribute "control".

months extracts the months, see section ‘Note’.

The dollar operator applied to a "timeDate" object, e.g. td$name, extracts a component of the date/time values as a numeric vector. Currently, name can be one of year, month, day, hour, minute, second, wday (or weekday), wday0 (or weekday0), and quarter. wday0 (weekday0) starts with 0 (for Sunday), the meaning of the rest should be clear.

In interactive sessions, completion is available for the dollar operator.

Value

for julian, a difftime object;

for atoms, a data.frame with attribute "control" containing the financial center of the input vector x. The data frame has the following components:

Y	year,
m	month,
d	day,
H	hour,
M	minute,
S	second;

for months, a numeric vector with attribute "control" containing the financial center. (Note: this use is deprecated, use $month instead.)

for the dollar method, the corresponding component as numeric vector.

Note

Deprecation Warning: a 'timeDate' method for 'months' has existed for a long time but it was returning a numeric vector, which is inconsistent with the other methods for months in base R (they return names of months). Returning a numeric vector when 'abbreviate' is missing is a temporary compromise, to avoid breaking old code but this should be considered deprecated. Use 'td$month' to get the numbers.

See Also

dayOfWeek, dayOfYear;

the base R functions julian, difftime, months;

Examples

## julian
tC = timeCalendar(2022)
julian(tC)[1:3]
   
## atoms
atoms(tC)
   
## months
months(tC)

weekdays(tC)
weekdays(tC, TRUE)

## the dollar method
tC$year
tC$month
tC$day
tC$hour
tC$minute
tC$second
tC$weekday
tC$weekday0

tC$quarter

timeDate documentation built on Sept. 22, 2024, 5:07 p.m.