Filters on DAX measure problem

[RobinwDNV]

Dear community, hopefully someone knows how to fix this seemingly simple issue that I can't figure out how to solve myself. 

I am creating measures that count the amount of employees that fit a certain set of criteria. 

one of them is 

NoPromotionGradeEntryDate =

CALCULATE(DISTINCTCOUNT('main data'[Person Number]);

'main data'[Promoted] = 0;

 'main data'[Grade Entry Date] < 04-01-2011) 

this returns blank. that is strange because if I put [person number] in a visual and apply the [promoted] and [grade entry date] as filters to the visual, it works fine. Also if i change to 'main data'[Grade Entry Date] > 04-01-2011 it also works. 
Does anyone know why "<" doesnt work, even though I definitely have a lot of rows that match the criteria, and ">" does work? 

Any input is welcome, thanks in advance!

Kind regards

[RobinwDNV · Accepted solution]

I found a workaround and now it works.  
the old formula is 

NoPromotionGradeEntryDate =

CALCULATE(DISTINCTCOUNT('main data'[Person Number]);

'main data'[Promoted] = 0;

 'main data'[Grade Entry Date] < 04-01-2011) 

I changed this to the new formula using DATE as a variable:

NoPromotionGradeEntryDate =

VAR _date = DATE(2011; 04; 01)

VAR _result = CALCULATE(DISTINCTCOUNT('main data'[Person Number]);

'main data'[Promoted] = 0;

 'main data'[Grade Entry Date] < _date)

RETURN _result

Hope this helps others with the same problem!

[WaqarArshad]

Hi, its asking for sign in 

[RobinwDNV]

Hi, Im sorry, i dont find a way to send or attach the PBI file to this post. but thank you for trying to help!

[WaqarArshad]

Can you check what format your date is in. Is it dd-mm-yyyy or mm-dd-yyyy. 

Sharing a sample file would also be helpful in diagnosing the issue

[RobinwDNV]

sample PBI I created a sample file I hope you can open it