"Fri, 13 Feb 1970 00:20:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700213
Only TIME
00:20:33
General datetime
1970-02-13 00:20:33Z
For Database
1970-02-13 00:20:33
For HTTP1.1
Fri, 13 Feb 1970 00:20:33 GMT