@remba87 you can create 2 date parameters, 1 for STARTDATE and another for ENDDATE. Make sure you set both up as Datetime data types. For your ENDDATE you can even set the default to a relative date of today to make sure it always defaults to the most recent date. You can even set it to the minute in time granularity since you are refreshing every 15 minutes. It will look something like this:
Then create a control from that parameter that will link to your date field within your dataset. This will allow the users to select both a start datetime and end datetime.
Now set between filter on your the datefield in your dataset where you use the parameter values for STARTDATE and ENDDATE as your start and end filters. Let me know how this works!
Here is an example of how the filter will look:
