"Fri, 23 Jan 1970 21:11:04"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
21:11:04
General datetime
1970-01-23 21:11:04Z
For Database
1970-01-23 21:11:04
For HTTP1.1
Fri, 23 Jan 1970 21:11:04 GMT