"Wed, 04 Feb 1970 00:20:28"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700204
Only TIME
00:20:28
General datetime
1970-02-04 00:20:28Z
For Database
1970-02-04 00:20:28
For HTTP1.1
Wed, 04 Feb 1970 00:20:28 GMT