"Mon, 02 Feb 1970 18:15:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700202
Only TIME
18:15:38
General datetime
1970-02-02 18:15:38Z
For Database
1970-02-02 18:15:38
For HTTP1.1
Mon, 02 Feb 1970 18:15:38 GMT