Default Date on dashboard

[Anonymous]

Hi I have  a question here

In my dashboard I have to select a date on selection. I want to make a default date for dashboard for example I just want to show my data on current month - 1 . If now we are in November, I want to show the data on october. How can I do that? is it using expression?

[shraddha_g]

If you have DateField/MonthStart Field then

Sum({<MonthStart = {"$(=date(addmonts(max(MonthStart),-1)))"}>}Value)