"Wed, 18 Feb 1970 18:16:12"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
18:16:12
General datetime
1970-02-18 18:16:12Z
For Database
1970-02-18 18:16:12
For HTTP1.1
Wed, 18 Feb 1970 18:16:12 GMT