"Tue, 06 Jan 1970 14:40:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
14:40:33
General datetime
1970-01-06 14:40:33Z
For Database
1970-01-06 14:40:33
For HTTP1.1
Tue, 06 Jan 1970 14:40:33 GMT