"Fri, 20 Feb 1970 21:42:09"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700220
Only TIME
21:42:09
General datetime
1970-02-20 21:42:09Z
For Database
1970-02-20 21:42:09
For HTTP1.1
Fri, 20 Feb 1970 21:42:09 GMT