"Mon, 02 Feb 1970 20:35:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700202
Only TIME
20:35:36
General datetime
1970-02-02 20:35:36Z
For Database
1970-02-02 20:35:36
For HTTP1.1
Mon, 02 Feb 1970 20:35:36 GMT