set analysis with function in modifier

[hillrunner]

Hello

I would like to have a graph which have as expression the count of the field [A]

but it should count the line only if the date field [B] is a date in 2021

So i wanted to have a set analysis like

count({$<year([B)={'2021'}>}[A])

It appears it doesn't work when there is a function in the modifier, is it true ? what i don't understand, thanks !

[MayilVahanan]

HI 

Try like below

count({$<B={'*2021*'}>}[A])

or being Year field and use like below

count({<YearField={2021}>}A)