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