"Sat, 17 Jan 1970 20:43:14"
Convert date and time to unixtime.
Another datetime format string at UTC
YYYYMMDD
19700117
Only TIME
20:43:14
General datetime
1970-01-17 20:43:14Z
For Database
1970-01-17 20:43:14
For HTTP1.1
Sat, 17 Jan 1970 20:43:14 GMT