"Tue, 17 Feb 1970 23:32:15"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700217
Only TIME
23:32:15
General datetime
1970-02-17 23:32:15Z
For Database
1970-02-17 23:32:15
For HTTP1.1
Tue, 17 Feb 1970 23:32:15 GMT