You can create a filter that only returns data for the past hour. Create a field called something like "Date Filter" - change the name of the date field to whatever yours is:
if datediff('hour',datetrunc('hour',[date]), datetrunc('hour',now())) <= 1 then "Include" else "Exclude" end
Put that on your filter shelf and select "Include".
Let me know if you have any questions.
If you have Datetime field in your data source then it will easy to filter the last one hour data using below logic. NOW() will do the trick, it will check your system date and time.
Display: datediff('hour',[Date time],NOW())=1
Drag Display to Filters and set to 'True'