"Mon, 23 Feb 1970 12:03:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700223
Only TIME
12:03:03
General datetime
1970-02-23 12:03:03Z
For Database
1970-02-23 12:03:03
For HTTP1.1
Mon, 23 Feb 1970 12:03:03 GMT