R: Date-time Constructor Functions

POSIXct {tis}

R Documentation

Date-time Constructor Functions

Description

Functions to create objects of classes "POSIXlt" and "POSIXct" representing calendar dates and times.

Usage

POSIXct(x, ...)
POSIXlt(x, ...)
## S3 method for class 'jul'
as.POSIXct(x, tz = "", ...)
## S3 method for class 'ti'
as.POSIXct(x, tz = "", offset = 1, ...)
## S3 method for class 'jul'
POSIXct(x, ...)
## S3 method for class 'numeric'
POSIXct(x, tz = "", origin, ...)
## S3 method for class 'ti'
POSIXct(x, offset = 1, ...)
## Default S3 method:
POSIXct(x, ...)
## S3 method for class 'jul'
POSIXlt(x, ...)
## S3 method for class 'ti'
POSIXlt(x, ...)
## Default S3 method:
POSIXlt(x, ...)

Arguments

`x`	An object to be converted.
`tz`	A timezone specification to be used for the conversion, if one is required. System-specific (see time zones), but `""` is the current timezone, and `"GMT"` is UTC (Universal Time, Coordinated).
`origin`	a date-time object, or something which can be coerced by `as.POSIXct(tz="GMT")` to such an object.
`offset`	a number between 0 and 1 specifying where in the period represented by the `ti` object `x` the desired time falls. `offset = 1` gives the first second of the period and `offset = 1` the last second, `offset = 0.5` the middle second, and so on.
`...`	other args passed to `ISOdatetime` (`POSIXct.jul` and `POSIXct.ti`), `as.POSIXct` or `as.POSIXlt` as appropriate. May include a `tz` argument as above.

Details

The default methods POSIXct.default and POSIXlt.default do nothing but call as.POSIXct and as.POSIXlt, respectively. The POSIXct.ti method can take an offset argument as explained above, and the POSIXct.jul method can handle jul objects with a fractional part. The ti and jul methods for POSIXlt just call the POSIXct constructor and then convert it's value to a POSIXlt object.

Value