"Fri, 06 Feb 1970 00:20:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700206
Only TIME
00:20:31
General datetime
1970-02-06 00:20:31Z
For Database
1970-02-06 00:20:31
For HTTP1.1
Fri, 06 Feb 1970 00:20:31 GMT