"Fri, 02 Jan 1970 14:40:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
14:40:36
General datetime
1970-01-02 14:40:36Z
For Database
1970-01-02 14:40:36
For HTTP1.1
Fri, 02 Jan 1970 14:40:36 GMT