"Wed, 18 Feb 1970 00:03:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
00:03:08
General datetime
1970-02-18 00:03:08Z
For Database
1970-02-18 00:03:08
For HTTP1.1
Wed, 18 Feb 1970 00:03:08 GMT