timeConvert(x, to.zone, from.zone)
The timeDate stores times/dates as their equivalent time in GMT, with a time zone (used for printing and other operations) stored in the time.zone slot. Therefore, to convert time zones, this function simply puts the new time zone into the time.zone slot. On the other hand, big-data time/date objects do not store a time zone. So, for these objects, this function actually converts the stored data from one time zone to another.
options(time.zone="GMT", time.in.format="%m/%d/%Y [%H:%M]", time.out.format="%m/%d/%Y %02H:%02M (%Z)") date1 <- timeDate("3/22/2002 12:00", zone="PST") date1 # 3/22/2002 12:00 (PST) date2 <- timeConvert(date1, "EST") date2 # converted to EST # 3/22/2002 15:00 (EST)