time-index-properties: Time Index Properties (Leap Years, Period Lengths, DST)

In tind: A Common Representation of Time Indices of Different Types

Time Index Properties (Leap Years, Period Lengths, DST)

Description

The following functions can be used to determine whether years are leap years, compute the number of subperiods within a period, and determine whether Daylight Saving Time is on for particular date-time index. All function are vectorised.

is.leap_year returns TRUE for leap years and FALSE for non-leap ones.

days_in_year and weeks_in_year return the number of days (365–366) and the number of weeks (52–53) in a year.

days_in_quarter and days_in_month return the number of days in a quarter (90–92) or a month (28–31), respectively.

hours_in_day returns the number of hours in a day (24 most of the time, a different number during DST/UTC offset changes).

is.dst returns TRUE when Daylight Saving Time is on and FALSE otherwise.

Usage

is.leap_year(x)

days_in_year(x)

weeks_in_year(x)

days_in_quarter(x)

days_in_month(x)

hours_in_day(x, tz = NULL)

is.dst(x)

Arguments

x	an object of tind class or an R object coercible to it.
tz	(optional) a character value determining the time zone (the default NULL is interpreted as the system time zone). See tzone documentation for information on time zones.

Value

is.leap_year and is.dst return logical vectors. The remaining functions return integer vectors, except for hours_in_day, which returns numeric vectors.

See Also

time-index-components, calendrical-computations, Ops, tzone, bizdays_in_month.

tind documentation built on Dec. 28, 2025, 1:06 a.m.