timezone_menu([$default = 'UTC'[, $class = ''[, $name = 'timezones'[, $attributes = '']]]])

local_to_gmt([$time = ''])

nice_date([$bad_date = ''[, $format = FALSE]])

gmt_to_local([$time = ''[, $timezone = 'UTC'[, $dst = FALSE]]])

timespan([$seconds = 1[, $time = ''[, $units = '']]])

standard_date([$fmt = 'DATE_RFC822'[, $time = NULL]])

mdate([$datestr = ''[, $time = '']])

timezones([$tz = ''])

now([$timezone = NULL])

unix_to_human([$time = ''[, $seconds = FALSE[, $fmt = 'us']]])