Convenience wrappers to create date-times from numeric representations.
ISOdatetime(year, month, day, hour, min, sec, tz = "")
ISOdate(year, month, day, hour = 12, min = 0, sec = 0, tz = "GMT")numerical values to specify a day.
numerical values for a time within a day. Fractional seconds are allowed.
A time zone specification to be used for the conversion.
"" is the current time zone and "GMT" is UTC. Invalid
values are most commonly treated as UTC, on some platforms with a warning.
An object of class "POSIXct".
ISOdatetime and ISOdate are convenience wrappers for
strptime that differ only in their defaults and that
ISOdate sets UTC as the time zone. For dates without times it
would normally be better to use the "Date" class.
The main arguments will be recycled using the usual recycling rules.
Because these make use of strptime, only years in the
range 0:9999 are accepted.
DateTimeClasses for details of the date-time classes;
strptime for conversions from character strings.