"Fri, 09 Jan 1970 21:12:48"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
21:12:48
General datetime
1970-01-09 21:12:48Z
For Database
1970-01-09 21:12:48
For HTTP1.1
Fri, 09 Jan 1970 21:12:48 GMT