"Mon, 16 Feb 1970 12:33:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700216
Only TIME
12:33:50
General datetime
1970-02-16 12:33:50Z
For Database
1970-02-16 12:33:50
For HTTP1.1
Mon, 16 Feb 1970 12:33:50 GMT