beginning_of_month($time)

Return time of beginning of month, 0:00:00. $time is optional and set to current time, if missing.

end_of_month($time)

Return time of end of month, 23:59:59. $time is optional and set to current time, if missing.

DEPENDENCY: leapyear

beginning_of_week($time)

Return time of beginning of week, 0:00:00. $time is optional and set to current time, if missing.

end_of_week($time)

Return time of end of week, 23:59:59. $time is optional and set to current time, if missing.