"Tue, 20 Jan 1970 11:21:38"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
11:21:38
General datetime
1970-01-20 11:21:38Z
For Database
1970-01-20 11:21:38
For HTTP1.1
Tue, 20 Jan 1970 11:21:38 GMT