"Tue, 20 Jan 1970 14:25:14"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
14:25:14
General datetime
1970-01-20 14:25:14Z
For Database
1970-01-20 14:25:14
For HTTP1.1
Tue, 20 Jan 1970 14:25:14 GMT