"Tue, 20 Jan 1970 07:50:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700120
Only TIME
07:50:48
General datetime
1970-01-20 07:50:48Z
For Database
1970-01-20 07:50:48
For HTTP1.1
Tue, 20 Jan 1970 07:50:48 GMT