"Mon, 02 Feb 1970 00:20:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700202
Only TIME
00:20:06
General datetime
1970-02-02 00:20:06Z
For Database
1970-02-02 00:20:06
For HTTP1.1
Mon, 02 Feb 1970 00:20:06 GMT