"Wed, 18 Feb 1970 14:12:11"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700218
Only TIME
14:12:11
General datetime
1970-02-18 14:12:11Z
For Database
1970-02-18 14:12:11
For HTTP1.1
Wed, 18 Feb 1970 14:12:11 GMT