"Fri, 02 Jan 1970 21:44:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
21:44:38
General datetime
1970-01-02 21:44:38Z
For Database
1970-01-02 21:44:38
For HTTP1.1
Fri, 02 Jan 1970 21:44:38 GMT