"Fri, 23 Jan 1970 00:20:33"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
00:20:33
General datetime
1970-01-23 00:20:33Z
For Database
1970-01-23 00:20:33
For HTTP1.1
Fri, 23 Jan 1970 00:20:33 GMT