"Fri, 02 Jan 1970 21:11:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700102
Only TIME
21:11:56
General datetime
1970-01-02 21:11:56Z
For Database
1970-01-02 21:11:56
For HTTP1.1
Fri, 02 Jan 1970 21:11:56 GMT