"Mon, 12 Jan 1970 21:48:17"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
21:48:17
General datetime
1970-01-12 21:48:17Z
For Database
1970-01-12 21:48:17
For HTTP1.1
Mon, 12 Jan 1970 21:48:17 GMT