"Tue, 20 Jan 1970 18:03:35"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
18:03:35
General datetime
1970-01-20 18:03:35Z
For Database
1970-01-20 18:03:35
For HTTP1.1
Tue, 20 Jan 1970 18:03:35 GMT