"Sat, 07 Feb 1970 19:39:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700207
Only TIME
19:39:31
General datetime
1970-02-07 19:39:31Z
For Database
1970-02-07 19:39:31
For HTTP1.1
Sat, 07 Feb 1970 19:39:31 GMT