"Wed, 18 Feb 1970 07:12:40"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
07:12:40
General datetime
1970-02-18 07:12:40Z
For Database
1970-02-18 07:12:40
For HTTP1.1
Wed, 18 Feb 1970 07:12:40 GMT