"Tue, 06 Jan 1970 21:11:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
21:11:31
General datetime
1970-01-06 21:11:31Z
For Database
1970-01-06 21:11:31
For HTTP1.1
Tue, 06 Jan 1970 21:11:31 GMT