"Mon, 05 Jan 1970 21:40:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
21:40:08
General datetime
1970-01-05 21:40:08Z
For Database
1970-01-05 21:40:08
For HTTP1.1
Mon, 05 Jan 1970 21:40:08 GMT