"Fri, 23 Jan 1970 21:43:09"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700123
Only TIME
21:43:09
General datetime
1970-01-23 21:43:09Z
For Database
1970-01-23 21:43:09
For HTTP1.1
Fri, 23 Jan 1970 21:43:09 GMT