~checkdate()~ — Validate a Gregorian date ~date()~ / ~gmdate()~ — Format a local/GMT time/date ~getdate()~ — Get date/time information (from a timestamp) ~gettimeofday()~ — Get current time (as an array) ~localtime()~ — Get the local time (as an array) ~mktime()~ / ~gmmktime()~ — Get Unix timestamp for a date ~strftime()~ / ~gmstrftime()~ — Format a local/GMT time/date according to locale settings ~strtotime()~ — Parse about any English textual datetime description into a Unix timestamp