"Mon, 23 Feb 1970 00:19:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700223
Only TIME
00:19:38
General datetime
1970-02-23 00:19:38Z
For Database
1970-02-23 00:19:38
For HTTP1.1
Mon, 23 Feb 1970 00:19:38 GMT