"Wed, 04 Feb 1970 18:27:02"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700204
Only TIME
18:27:02
General datetime
1970-02-04 18:27:02Z
For Database
1970-02-04 18:27:02
For HTTP1.1
Wed, 04 Feb 1970 18:27:02 GMT