"Mon, 05 Jan 1970 21:38:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700105
Only TIME
21:38:08
General datetime
1970-01-05 21:38:08Z
For Database
1970-01-05 21:38:08
For HTTP1.1
Mon, 05 Jan 1970 21:38:08 GMT