timezone-make-date-sortable

timezone-make-date-sortable is a compiled Lisp function in `timezone.el'.

(timezone-make-date-sortable DATE &optional LOCAL TIMEZONE)

Convert DATE to a sortable date string.
Optional 2nd argument LOCAL specifies the default local timezone of the DATE;
if nil, GMT is assumed.
Optional 3rd argument TIMEZONE specifies a timezone to be represented in;
if nil, the local time zone is assumed.