"Fri, 09 Jan 1970 21:12:44"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
21:12:44
General datetime
1970-01-09 21:12:44Z
For Database
1970-01-09 21:12:44
For HTTP1.1
Fri, 09 Jan 1970 21:12:44 GMT