"Fri, 23 Jan 1970 20:42:36"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
20:42:36
General datetime
1970-01-23 20:42:36Z
For Database
1970-01-23 20:42:36
For HTTP1.1
Fri, 23 Jan 1970 20:42:36 GMT