"Fri, 02 Jan 1970 18:14:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
18:14:31
General datetime
1970-01-02 18:14:31Z
For Database
1970-01-02 18:14:31
For HTTP1.1
Fri, 02 Jan 1970 18:14:31 GMT