"Wed, 04 Feb 1970 00:19:30"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700204
Only TIME
00:19:30
General datetime
1970-02-04 00:19:30Z
For Database
1970-02-04 00:19:30
For HTTP1.1
Wed, 04 Feb 1970 00:19:30 GMT