"Sun, 11 Jan 1970 21:42:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700111
Only TIME
21:42:31
General datetime
1970-01-11 21:42:31Z
For Database
1970-01-11 21:42:31
For HTTP1.1
Sun, 11 Jan 1970 21:42:31 GMT