"Mon, 05 Jan 1970 00:39:13"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
00:39:13
General datetime
1970-01-05 00:39:13Z
For Database
1970-01-05 00:39:13
For HTTP1.1
Mon, 05 Jan 1970 00:39:13 GMT