"Fri, 23 Jan 1970 21:11:03"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
21:11:03
General datetime
1970-01-23 21:11:03Z
For Database
1970-01-23 21:11:03
For HTTP1.1
Fri, 23 Jan 1970 21:11:03 GMT