• date_start() computes the date at the start of a particular precision, such as the "start of the year".

  • date_end() computes the date at the end of a particular precision, such as the "end of the month".

There are separate help pages for computing boundaries for dates and date-times:

date_start(x, precision, ...)

date_end(x, precision, ...)

Arguments

x

[Date / POSIXct / POSIXlt]

A date or date-time vector.

precision

[character(1)]

A precision. Allowed precisions are dependent on the input used.

...

These dots are for future extensions and must be empty.

Value

x but with some components altered to be at the boundary value.

Examples

# See type specific documentation for more examples x <- date_build(2019, 2:4) date_end(x, "month")
#> [1] "2019-02-28" "2019-03-31" "2019-04-30"
x <- date_time_build(2019, 2:4, 3:5, 4, 5, zone = "America/New_York") # Note that the hour, minute, and second components are also adjusted date_end(x, "month")
#> [1] "2019-02-28 23:59:59 EST" "2019-03-31 23:59:59 EDT" #> [3] "2019-04-30 23:59:59 EDT"