CFCalendarStandard {CFtime} | R Documentation |
Standard CF calendar
Description
This class represents a standard calendar of 365 or 366 days per year. This calendar is compatible with the standard POSIXt calendar for periods after the introduction of the Gregorian calendar, 1582-10-15 00:00:00. The calendar starts at 0001-01-01 00:00:00, e.g. the start of the Common Era.
Note that this calendar, despite its name, is not the same as that used in ISO8601 or many computer systems for periods prior to the introduction of the Gregorian calendar. Use of the "proleptic_gregorian" calendar is recommended for periods before or straddling the introduction date, as that calendar is compatible with POSIXt on most OSes.
Super class
CFtime::CFCalendar
-> CFCalendarStandard
Methods
Public methods
Inherited methods
Method new()
Create a new CF calendar. When called with the deprecated 'gregorian' it is automatically converted to the equivalent 'standard'.
Usage
CFCalendarStandard$new(nm, definition)
Arguments
nm
The name of the calendar. This must be "standard" or "gregorian" (deprecated).
definition
The string that defines the units and the origin, as per the CF Metadata Conventions.
Returns
A new instance of this class.
Method valid_days()
Indicate which of the supplied dates are valid.
Usage
CFCalendarStandard$valid_days(ymd)
Arguments
ymd
data.frame
with dates parsed into their parts in columnsyear
,month
andday
. 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 is_gregorian_date()
Indicate which of the supplied dates are in the Gregorian part of the calendar, e.g. 1582-10-15 or after.
Usage
CFCalendarStandard$is_gregorian_date(ymd)
Arguments
ymd
data.frame
with dates parsed into their parts in columnsyear
,month
andday
. Any other columns are disregarded.
Returns
Logical vector with the same length as argument ymd
has rows
with TRUE
for days in the Gregorian part of the calendar and FALSE
otherwise, or NA
where the row in argument ymd
has NA
values.
Method POSIX_compatible()
Indicate if the time series described using this calendar
can be safely converted to a standard date-time type (POSIXct
,
POSIXlt
, Date
). This is only the case if all offsets are for
timestamps fall on or after the start of the Gregorian calendar,
1582-10-15 00:00:00.
Usage
CFCalendarStandard$POSIX_compatible(offsets)
Arguments
offsets
The offsets from the CFtime instance.
Returns
TRUE
.
Method month_days()
Determine the number of days in the month of the calendar.
Usage
CFCalendarStandard$month_days(ymd = NULL)
Arguments
ymd
data.frame
, optional, with dates parsed into their parts.
Returns
A vector indicating the number of days in each month for the
dates supplied as argument ymd
. If no dates are supplied, the number
of days per month for the calendar as a vector of length 12, for a
regular year without a leap day.
Method leap_year()
Indicate which years are leap years.
Usage
CFCalendarStandard$leap_year(yr)
Arguments
yr
Integer 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
CFCalendarStandard$date2offset(x)
Arguments
x
data.frame
. Dates to calculate the difference for.
Returns
Integer vector of a length equal to the number of rows in
argument x
indicating the number of days between x
and the origin
of the calendar, or NA
for rows in x
with NA
values.
Method offset2date()
Calculate date parts from day differences from the origin. This only deals with days as these are impacted by the calendar. Hour-minute-second timestamp parts are handled in CFCalendar.
Usage
CFCalendarStandard$offset2date(x)
Arguments
x
Integer 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
CFCalendarStandard$clone(deep = FALSE)
Arguments
deep
Whether to make a deep clone.