"Tue, 20 Jan 1970 14:12:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
14:12:06
General datetime
1970-01-20 14:12:06Z
For Database
1970-01-20 14:12:06
For HTTP1.1
Tue, 20 Jan 1970 14:12:06 GMT