How can I count responses from Forms only for week days (not weekends) with DAX?

[chang_jp]

I have about 200 hundread students atending class and each class they must fill a form. However there are students sending more than once a day and I can not block for one responce a day.  how ever i would like to count how my responses or attendences  I have. 
I have the DAX below however it gives me all the count of responses from forms.  How can i change to i can have it count only the ones aswered on week days (monday to friday) ?Some of the students are sending during weekends however i woud like NOT count them as valid. By the way i calculate the atendence per quater of the year and my students must atend at least 16 times. 

M_Q1_dist_Attendance Count = 
CALCULATE(
    distinctcount('礼拝Forms'[Completion time]),
    FILTER(
        '礼拝Forms',
        '礼拝Forms'[Completion time] >= DATE(2023,4,1) &&
        '礼拝Forms'[Completion time] <= DATE(2023,6,5)
    )
)

[lbendlin]

Please provide sample data that covers your issue or question completely, in a usable format (not as a screenshot).
https://community.powerbi.com/t5/Community-Blog/How-to-provide-sample-data-in-the-Power-BI-Forum/ba-...
Please show the expected outcome based on the sample data you provided.

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523