"Mon, 05 Jan 1970 21:48:45"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
21:48:45
General datetime
1970-01-05 21:48:45Z
For Database
1970-01-05 21:48:45
For HTTP1.1
Mon, 05 Jan 1970 21:48:45 GMT