"Mon, 12 Jan 1970 21:48:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700112
Only TIME
21:48:35
General datetime
1970-01-12 21:48:35Z
For Database
1970-01-12 21:48:35
For HTTP1.1
Mon, 12 Jan 1970 21:48:35 GMT