"Fri, 02 Jan 1970 21:12:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
21:12:40
General datetime
1970-01-02 21:12:40Z
For Database
1970-01-02 21:12:40
For HTTP1.1
Fri, 02 Jan 1970 21:12:40 GMT