"Mon, 09 Feb 1970 19:40:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700209
Only TIME
19:40:50
General datetime
1970-02-09 19:40:50Z
For Database
1970-02-09 19:40:50
For HTTP1.1
Mon, 09 Feb 1970 19:40:50 GMT