Functions to create objects of classes "POSIXlt" and
"POSIXct" representing calendar dates and times.
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.
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.
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 and link{as.POSIXlt} for the default
conversion functions, and DateTimeClasses for details of the
classes.