Date-time must be a POSIXct, POSIXlt, Date, chron, yearmon, yearqtr,
zoo, zooreg, timeDate, xts, its, ti, jul, timeSeries, and fts
objects. Setting tz does not update a date-time to display the same moment as
measured at a different time zone. See with_tz
. Setting
a new time zone creates a new date-time. The numerical value of the
hours element stays the same, only the time zone attribute is
replaced. This creates a new date-time that occurs an integer value
of hours before or after the original date-time.
If x is of a class that displays all date-times in the GMT timezone,
such as chron, then R will update the number in the hours element to
display the new date-time in the GMT timezone.
For a description of the time zone attribute, see
DateTimeClasses
.