"Tue, 20 Jan 1970 09:23:11"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
09:23:11
General datetime
1970-01-20 09:23:11Z
For Database
1970-01-20 09:23:11
For HTTP1.1
Tue, 20 Jan 1970 09:23:11 GMT