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_type2(x, y) # S3 method for POSIXt vec_type2(x, y) # S3 method for difftime vec_type2(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 difftime vec_arith(op, x, y)
| x | A double vector representing the number of days since UNIX
epoch for |
|---|---|
| tzone | Time zone. A character vector of length 1. Either |
| units | Units of duration. |
These function help the base Date, POSIXct, and difftime classes fit
into the vctrs type system by providing constructors, coercion functions,
and casting functions.
new_date(0)#> [1] "1970-01-01"new_datetime(0, tzone = "UTC")#> [1] "1970-01-01 UTC"new_duration(1, "hour")#> Time difference of 1 hours