CFCalendarJulian: Julian CF calendar
In CFtime: Using CF-Compliant Calendars with Climate Projection Data
CFCalendarJulian R Documentation
Julian CF calendar
Description
This class represents a Julian calendar of 365 days per year,
with every fourth year being a leap year of 366 days. The months and the
year align with the standard calendar. This calendar is not compatible with
the standard POSIXt calendar.
This calendar starts on 1 January of year 1: 0001-01-01 00:00:00. Any dates
before this will generate an error.
Super class
CFtime::CFCalendar -> CFCalendarJulian
Methods
Public methods
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Inherited methods
Method new()
Create a new CF calendar.
Usage
CFCalendarJulian$new(nm, definition)
Arguments
nmThe name of the calendar. This must be "julian". This argument
is superfluous but maintained to be consistent with the initialization
methods of the parent and sibling classes.
definitionThe string that defines the units and the origin, as
per the CF Metadata Conventions.
Returns
A new instance of this class.
Method valid_days()
Indicate which of the supplied dates are valid.
Usage
CFCalendarJulian$valid_days(ymd)
Arguments
ymddata.frame with dates parsed into their parts in columns
year, month and day. Any other columns are disregarded.
Returns
Logical vector with the same length as argument ymd has rows
with TRUE for valid days and FALSE for invalid days, or NA where
the row in argument ymd has NA values.
Method month_days()
Determine the number of days in the month of the calendar.
Usage
CFCalendarJulian$month_days(ymd = NULL)
Arguments
ymddata.frame, optional, with dates parsed into their parts.
Returns
A vector indicating the number of days in each month for the
dates supplied as argument ymd. If no dates are supplied, the number
of days per month for the calendar as a vector of length 12, for a
regular year without a leap day.
Method leap_year()
Indicate which years are leap years.
Usage
CFCalendarJulian$leap_year(yr)
Arguments
yrInteger vector of years to test.
Returns
Logical vector with the same length as argument yr. NA is
returned where elements in argument yr are NA.
Method date2offset()
Calculate difference in days between a data.frame of time
parts and the origin.
Usage
CFCalendarJulian$date2offset(x)
Arguments
xdata.frame. Dates to calculate the difference for.
Returns
Integer vector of a length equal to the number of rows in
argument x indicating the number of days between x and the origin
of the calendar, or NA for rows in x with NA values.
Method offset2date()
Calculate date parts from day differences from the origin. This
only deals with days as these are impacted by the calendar.
Hour-minute-second timestamp parts are handled in CFCalendar.
Usage
CFCalendarJulian$offset2date(x)
Arguments
xInteger vector of days to add to the origin.
Returns
A data.frame with columns 'year', 'month' and 'day' and as many
rows as the length of vector x.
Method clone()
The objects of this class are cloneable with this method.
Usage
CFCalendarJulian$clone(deep = FALSE)
Arguments
deepWhether to make a deep clone.
CFtime documentation built on April 12, 2025, 5:07 p.m.
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| CFCalendarJulian | R Documentation |
Julian CF calendar
Description
This class represents a Julian calendar of 365 days per year, with every fourth year being a leap year of 366 days. The months and the year align with the standard calendar. This calendar is not compatible with the standard POSIXt calendar.
This calendar starts on 1 January of year 1: 0001-01-01 00:00:00. Any dates before this will generate an error.
Super class
CFtime::CFCalendar -> CFCalendarJulian
Methods
Public methods
Inherited methods
Method new()
Create a new CF calendar.
Usage
CFCalendarJulian$new(nm, definition)
Arguments
nmThe name of the calendar. This must be "julian". This argument is superfluous but maintained to be consistent with the initialization methods of the parent and sibling classes.
definitionThe string that defines the units and the origin, as per the CF Metadata Conventions.
Returns
A new instance of this class.
Method valid_days()
Indicate which of the supplied dates are valid.
Usage
CFCalendarJulian$valid_days(ymd)
Arguments
ymddata.framewith dates parsed into their parts in columnsyear,monthandday. Any other columns are disregarded.
Returns
Logical vector with the same length as argument ymd has rows
with TRUE for valid days and FALSE for invalid days, or NA where
the row in argument ymd has NA values.
Method month_days()
Determine the number of days in the month of the calendar.
Usage
CFCalendarJulian$month_days(ymd = NULL)
Arguments
ymddata.frame, optional, with dates parsed into their parts.
Returns
A vector indicating the number of days in each month for the
dates supplied as argument ymd. If no dates are supplied, the number
of days per month for the calendar as a vector of length 12, for a
regular year without a leap day.
Method leap_year()
Indicate which years are leap years.
Usage
CFCalendarJulian$leap_year(yr)
Arguments
yrInteger vector of years to test.
Returns
Logical vector with the same length as argument yr. NA is
returned where elements in argument yr are NA.
Method date2offset()
Calculate difference in days between a data.frame of time
parts and the origin.
Usage
CFCalendarJulian$date2offset(x)
Arguments
xdata.frame. Dates to calculate the difference for.
Returns
Integer vector of a length equal to the number of rows in
argument x indicating the number of days between x and the origin
of the calendar, or NA for rows in x with NA values.
Method offset2date()
Calculate date parts from day differences from the origin. This only deals with days as these are impacted by the calendar. Hour-minute-second timestamp parts are handled in CFCalendar.
Usage
CFCalendarJulian$offset2date(x)
Arguments
xInteger vector of days to add to the origin.
Returns
A data.frame with columns 'year', 'month' and 'day' and as many
rows as the length of vector x.
Method clone()
The objects of this class are cloneable with this method.
Usage
CFCalendarJulian$clone(deep = FALSE)
Arguments
deepWhether to make a deep clone.
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