"Wed, 04 Feb 1970 20:38:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700204
Only TIME
20:38:13
General datetime
1970-02-04 20:38:13Z
For Database
1970-02-04 20:38:13
For HTTP1.1
Wed, 04 Feb 1970 20:38:13 GMT