When we use date as filter then do like below.
Parameters as DATEPART filters
To filter by date part, use the same nomenclature as in the default Tableau Desktop date hierarchy. For more information, see Date Functions in the Tableau Help.
quarter(Order%20Date) Integer between 1 and 4 month(Order%20Date) Integer between 1 and 12 day(Order%20Date) Integer between 1 and 31 hour(Order%20Date) Integer 0–23 minute(Order%20Date) Integer 0–59 second(Order%20Date) Integer 0–59 week(Order%20Date) Integer 1–53 my(Order%20Date) Six-digit integer: YYYYMM mdy(Order%20Date) Eight-digit integer: YYYYMMDD
Thank you but maybe I didn't develop my problem enough.
In the first Dashboard, the user can define start date and end date and it's linked with the charts.
Also, the user can click on a chart and open a new Dashboard with other charts and this charts should be filtered on the same period, with the start date and end date defined by himself before.
So I can't use a date function in my URL, I need the real values of my parameters Start date and End date.