"Tue, 17 Feb 1970 12:54:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700217
Only TIME
12:54:33
General datetime
1970-02-17 12:54:33Z
For Database
1970-02-17 12:54:33
For HTTP1.1
Tue, 17 Feb 1970 12:54:33 GMT