"Fri, 13 Feb 1970 21:42:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700213
Only TIME
21:42:08
General datetime
1970-02-13 21:42:08Z
For Database
1970-02-13 21:42:08
For HTTP1.1
Fri, 13 Feb 1970 21:42:08 GMT