"Tue, 27 Jan 1970 07:46:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700127
Only TIME
07:46:31
General datetime
1970-01-27 07:46:31Z
For Database
1970-01-27 07:46:31
For HTTP1.1
Tue, 27 Jan 1970 07:46:31 GMT