"Mon, 20 Apr 1970 07:12:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700420
Only TIME
07:12:31
General datetime
1970-04-20 07:12:31Z
For Database
1970-04-20 07:12:31
For HTTP1.1
Mon, 20 Apr 1970 07:12:31 GMT