"Fri, 09 Jan 1970 21:48:54"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
21:48:54
General datetime
1970-01-09 21:48:54Z
For Database
1970-01-09 21:48:54
For HTTP1.1
Fri, 09 Jan 1970 21:48:54 GMT