Date, date-time, and duration S3 classes

Source: R/type-date-time.R

  • A date (Date) is a double vector. Its value represent the number of days since the Unix "epoch", 1970-01-01. It has no attributes.

  • A datetime (POSIXct is a double vector. Its value represents the number of seconds since the Unix "Epoch", 1970-01-01. It has a single attribute: the timezone (tzone))

  • A duration (difftime)

new_date(x = double())

new_datetime(x = double(), tzone = "")

new_duration(x = double(), units = c("secs", "mins", "hours", "days", "weeks"))

# S3 method for Date
vec_ptype2(x, y, ...)

# S3 method for POSIXct
vec_ptype2(x, y, ...)

# S3 method for POSIXlt
vec_ptype2(x, y, ...)

# S3 method for difftime
vec_ptype2(x, y, ...)

# S3 method for Date
vec_cast(x, to, ...)

# S3 method for POSIXct
vec_cast(x, to, ...)

# S3 method for POSIXlt
vec_cast(x, to, ...)

# S3 method for difftime
vec_cast(x, to, ...)

# S3 method for Date
vec_arith(op, x, y, ...)

# S3 method for POSIXct
vec_arith(op, x, y, ...)

# S3 method for POSIXlt
vec_arith(op, x, y, ...)

# S3 method for difftime
vec_arith(op, x, y, ...)

Arguments

x

A double vector representing the number of days since UNIX epoch for new_date(), number of seconds since UNIX epoch for new_datetime(), and number of units for new_duration().
tzone

Time zone. A character vector of length 1. Either "" for the local time zone, or a value from OlsonNames()
units

Units of duration.

Details

These function help the base Date, POSIXct, and difftime classes fit into the vctrs type system by providing constructors, coercion functions, and casting functions.

Examples

new_date(0)
#> [1] "1970-01-01"
new_datetime(0, tzone = "UTC")
#> [1] "1970-01-01 UTC"
new_duration(1, "hours")
#> Time difference of 1 hours