working day

Aarti1 ,

First, I assume by "working day" you are referring to Weekdays only and want to exclude Saturday and Sunday.

On this basis, I used my Dim_Date (ie Calendar) table and came up with the following:

WorkingDayofMonth = 
    RANKX(
        FILTER(
                DIM_Date,
                DIM_Date[MMYYYY]=EARLIER(DIM_Date[MMYYYY]) &&
                DIM_Date[IsWeekday] = TRUE()
                ),
        DIM_Date[DayOfMonth],,ASC,Skip
        )

Date	DayName	IsWeekday	DayOfMonth	WorkingDayofMonth
1-Sep-19	Sunday	False	1	1
2-Sep-19	Monday	True	2	1
3-Sep-19	Tuesday	True	3	2
4-Sep-19	Wednesday	True	4	3
5-Sep-19	Thursday	True	5	4
6-Sep-19	Friday	True	6	5
7-Sep-19	Saturday	False	7	6
8-Sep-19	Sunday	False	8	6
9-Sep-19	Monday	True	9	6
10-Sep-19	Tuesday	True	10	7
11-Sep-19	Wednesday	True	11	8
12-Sep-19	Thursday	True	12	9
13-Sep-19	Friday	True	13	10
14-Sep-19	Saturday	False	14	11
15-Sep-19	Sunday	False	15	11
16-Sep-19	Monday	True	16	11
17-Sep-19	Tuesday	True	17	12
18-Sep-19	Wednesday	True	18	13
19-Sep-19	Thursday	True	19	14
20-Sep-19	Friday	True	20	15
21-Sep-19	Saturday	False	21	16
22-Sep-19	Sunday	False	22	16
23-Sep-19	Monday	True	23	16
24-Sep-19	Tuesday	True	24	17
25-Sep-19	Wednesday	True	25	18
26-Sep-19	Thursday	True	26	19
27-Sep-19	Friday	True	27	20
28-Sep-19	Saturday	False	28	21
29-Sep-19	Sunday	False	29	21
30-Sep-19	Monday	True	30	21

So, 9/16/2019 is the 11th Working Day of that Month Year.

Hope this is a solution that can work for you.

Regards,