"Mon, 02 Feb 1970 20:35:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700202
Only TIME
20:35:31
General datetime
1970-02-02 20:35:31Z
For Database
1970-02-02 20:35:31
For HTTP1.1
Mon, 02 Feb 1970 20:35:31 GMT