"Wed, 04 Feb 1970 00:20:05"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700204
Only TIME
00:20:05
General datetime
1970-02-04 00:20:05Z
For Database
1970-02-04 00:20:05
For HTTP1.1
Wed, 04 Feb 1970 00:20:05 GMT