"Mon, 09 Feb 1970 00:20:01"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700209
Only TIME
00:20:01
General datetime
1970-02-09 00:20:01Z
For Database
1970-02-09 00:20:01
For HTTP1.1
Mon, 09 Feb 1970 00:20:01 GMT