Date-time Constructor Functions

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

utilities, chron
POSIXct(x, …)
POSIXlt(x, …)
# S3 method for jul
as.POSIXct(x, tz = "", …)
# S3 method for ti
as.POSIXct(x, tz = "", offset = 1, …)
# S3 method for jul
POSIXct(x, …)
# S3 method for numeric
POSIXct(x, tz = "", origin, …)
# S3 method for ti
POSIXct(x, offset = 1, …)
# S3 method for default
POSIXct(x, …)
# S3 method for jul
POSIXlt(x, …)
# S3 method for ti
POSIXlt(x, …)
# S3 method for default
POSIXlt(x, …)

An object to be converted.


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).


a date-time object, or something which can be coerced by as.POSIXct(tz="GMT") to such an object.


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.


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.


as.POSIXct, POSIXct and POSIXlt return objects of the appropriate class. If tz was specified it will be reflected in the "tzone" attribute of the result.

See Also

as.POSIXct and link{as.POSIXlt} for the default conversion functions, and DateTimeClasses for details of the classes.

  • as.POSIXct.jul
  • as.POSIXct.ti
  • POSIXct
  • POSIXct.jul
  • POSIXct.numeric
  • POSIXct.ti
  • POSIXct.default
  • POSIXlt
  • POSIXlt.jul
  • POSIXlt.ti
  • POSIXlt.default
Documentation reproduced from package tis, version 1.37.1, License: Unlimited

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