"Fri, 09 Jan 1970 00:39:23"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
00:39:23
General datetime
1970-01-09 00:39:23Z
For Database
1970-01-09 00:39:23
For HTTP1.1
Fri, 09 Jan 1970 00:39:23 GMT