Looking at the help topic on this function there is a note saying: For a numeric field you need to provide the numeric value.
Dates are numeric in qlik so when using selectValues on date fields, you must use the numeric equivalent of the dates. i.e. to set the date filter to 11/09/1980, the function must be called with app.field('Date').selectValues(, true);
Hi, first of all thank you for your prompt reply.
Looking at the Qlik's Date and Time documentation, I spotted the baseline
"Functions are based on a date-time serial number that equals the number of days since December 30, 1899. The integer value represents the day and the fractional value represents the time of the day."
I managed to create the conversion from a selected date in my frontend to a numeric value based on Qlik's conversion. Now the call to app.field('Date').selectValues([qlikNumDate], true); works like a charm!
Thank you very much for your help. Correct answer!