"Fri, 20 Feb 1970 14:12:06"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700220
Only TIME
14:12:06
General datetime
1970-02-20 14:12:06Z
For Database
1970-02-20 14:12:06
For HTTP1.1
Fri, 20 Feb 1970 14:12:06 GMT