"Tue, 17 Feb 1970 04:42:32"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700217
Only TIME
04:42:32
General datetime
1970-02-17 04:42:32Z
For Database
1970-02-17 04:42:32
For HTTP1.1
Tue, 17 Feb 1970 04:42:32 GMT