DAX comparison operations ERROR when the data types are the same

[redgerly]

I am having trouble with data types thats causing an error in a formula.  I consistently get this error "DAX comparison operations do not support comparing values of type Text with values of type Date. Consider using the VALUE or FORMAT function to convert one of the values."  YET my data types are seemingly correct.  

Here is my formula:

Facility = VAR StayDate = 'public alert'[alert_date]

Return

    CALCULATE(

        //Arbitrary tie-breaker

        FIRSTNONBLANK('public patient_stays_detailed_view'[admit_date],0),

        CALCULATETABLE(

            LASTNONBLANK('public patient_stays_detailed_view'[admit_date],0),

            'public patient_stays_detailed_view'[facility_name] <= StayDate))

My date values are admit_date and alert_date.   Here's how they look.  Also, in both instances, I've removed all null or blank values.  WHAT AM I MISSING HERE?  

[Greg_Deckler]

@redgerly Seems like you are trying to determine if the facility_name (assuming this is text) is <= a date value, which is highly unlikely to work out or be meaningful in any way.

'public patient_stays_detailed_view'[facility_name] <= StayDate)