"Tue, 17 Feb 1970 14:45:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700217
Only TIME
14:45:13
General datetime
1970-02-17 14:45:13Z
For Database
1970-02-17 14:45:13
For HTTP1.1
Tue, 17 Feb 1970 14:45:13 GMT