Working Days based on start date

Hi， hemendranath 

You need a ‘Holiday Table’ that lists all your holiday so that you can add a calculated column to 'Calendar' Table to mark all your working days.

Workday =
IF (
    WEEKDAY ( 'Calendar'[Date], 2 )
        IN { 1, 2, 3, 4, 5 }
            && NOT 'Calendar'[Date] IN VALUES ( 'Holiday Table'[Date] ),
    "Workday",
    "Weenkends/hoiliday"
)

Then, you can try the following formula to calculate the end date.

End Date = 
CALCULATE (
    MAX( 'Calendar'[Date] ),
    FILTER (
        'Calendar',
        NETWORKDAYS (
            MAX ( 'Table'[Date] ),
            'Calendar'[Date],
            1,
            VALUES ( 'Holiday Table'[Date] )
        ) = 10
            && 'Calendar'[Workday] = "Workday"
    )
)

Best Regards,
Community Support Team _ Eason
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