"Fri, 06 Feb 1970 19:39:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700206
Only TIME
19:39:33
General datetime
1970-02-06 19:39:33Z
For Database
1970-02-06 19:39:33
For HTTP1.1
Fri, 06 Feb 1970 19:39:33 GMT