"Wed, 18 Feb 1970 00:52:31"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
00:52:31
General datetime
1970-02-18 00:52:31Z
For Database
1970-02-18 00:52:31
For HTTP1.1
Wed, 18 Feb 1970 00:52:31 GMT