"Mon, 16 Feb 1970 12:02:34"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700216
Only TIME
12:02:34
General datetime
1970-02-16 12:02:34Z
For Database
1970-02-16 12:02:34
For HTTP1.1
Mon, 16 Feb 1970 12:02:34 GMT