"Mon, 09 Feb 1970 00:52:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700209
Only TIME
00:52:44
General datetime
1970-02-09 00:52:44Z
For Database
1970-02-09 00:52:44
For HTTP1.1
Mon, 09 Feb 1970 00:52:44 GMT