"Fri, 23 Jan 1970 23:37:56"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
23:37:56
General datetime
1970-01-23 23:37:56Z
For Database
1970-01-23 23:37:56
For HTTP1.1
Fri, 23 Jan 1970 23:37:56 GMT