"Tue, 06 Jan 1970 09:21:50"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
09:21:50
General datetime
1970-01-06 09:21:50Z
For Database
1970-01-06 09:21:50
For HTTP1.1
Tue, 06 Jan 1970 09:21:50 GMT