Hi @AmyRoust,
As you noted in your post, this is possible by using an Arcade expression in an Indicator widget on a dashboard. In order to do this, you need to modify an existing Indicator widget and use an expression similar to the example below:
var startDate = Today();
var endDate = Date(2021,9,28);
var daysLeft = DateDiff(endDate, startDate,'day');
return {
middleText: daysLeft,
middleTextMaxSize: 'large',
bottomText: 'Days left...!',
}
This will calculate the difference between today's date and the end date that you specify in days and shows the results on your Indicator. These dates can be defined static dates or from the attributes of a feature layer or table used in your dashboard. Notice that when using the Date function, months are defined by 0-11 instead of 1-12 (e.g. 9 is October).
Best,
MJ