"Tue, 17 Feb 1970 07:11:49"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700217
Only TIME
07:11:49
General datetime
1970-02-17 07:11:49Z
For Database
1970-02-17 07:11:49
For HTTP1.1
Tue, 17 Feb 1970 07:11:49 GMT