"Tue, 06 Jan 1970 23:38:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
23:38:31
General datetime
1970-01-06 23:38:31Z
For Database
1970-01-06 23:38:31
For HTTP1.1
Tue, 06 Jan 1970 23:38:31 GMT