"Tue, 17 Feb 1970 07:12:21"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700217
Only TIME
07:12:21
General datetime
1970-02-17 07:12:21Z
For Database
1970-02-17 07:12:21
For HTTP1.1
Tue, 17 Feb 1970 07:12:21 GMT