"Tue, 20 Jan 1970 14:15:01"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
14:15:01
General datetime
1970-01-20 14:15:01Z
For Database
1970-01-20 14:15:01
For HTTP1.1
Tue, 20 Jan 1970 14:15:01 GMT