"Sat, 17 Jan 1970 09:17:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
09:17:08
General datetime
1970-01-17 09:17:08Z
For Database
1970-01-17 09:17:08
For HTTP1.1
Sat, 17 Jan 1970 09:17:08 GMT