"Fri, 09 Jan 1970 04:39:18"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700109
Only TIME
04:39:18
General datetime
1970-01-09 04:39:18Z
For Database
1970-01-09 04:39:18
For HTTP1.1
Fri, 09 Jan 1970 04:39:18 GMT