filter by today's date

You need to try something like this

calculate(count(form[id]),filter(form,form[publish_date]=today(),form[_date]=today()))

In case you want to filter using a slicer. Create a date dimension table and join it with all dates. Other than one join, all joins will be inactive.

Date calendar

https://radacad.com/creating-calendar-table-in-power-bi-using-dax-functions

Example how to change the date in a formula

https://community.powerbi.com/t5/Desktop/DATE-RANGE-SLICERS-TO-COMPARE-NETSALES-OF-A-DATE-RANGE/td-p/42251

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Thanks.

My Recent Blog - https://community.powerbi.com/t5/Community-Blog/Comparing-Data-Across-Date-Ranges/ba-p/823601