"Tue, 06 Jan 1970 23:31:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700106
Only TIME
23:31:48
General datetime
1970-01-06 23:31:48Z
For Database
1970-01-06 23:31:48
For HTTP1.1
Tue, 06 Jan 1970 23:31:48 GMT