"Mon, 12 Jan 1970 14:57:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
14:57:31
General datetime
1970-01-12 14:57:31Z
For Database
1970-01-12 14:57:31
For HTTP1.1
Mon, 12 Jan 1970 14:57:31 GMT