You can use Variable in this case:
There are few extensions available on the Branch that will allow your users to enter Variables' values, so your you just need to add these variables into your Measures:
The Measure above will show all data points between vDR1Start and vDR1End Dates...
Thanks for the reply Vladimir
My data is generated from a SQL stored procedure which requires a from and to date as parameter values.
I haven't seen much information / solutions in Qlik (so far) that allows users to enter values and then generate the data based on these values.
Qlik would appear to be more driven towards getting the data loaded and filter / tailor it after it's loaded as opposed to being generated on the fly.