"Sat, 17 Jan 1970 14:24:08"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
14:24:08
General datetime
1970-01-17 14:24:08Z
For Database
1970-01-17 14:24:08
For HTTP1.1
Sat, 17 Jan 1970 14:24:08 GMT