Count Distinct Customer IDs for New Customers using Measures Only

Hi, VBAmazing 

Based on your information, I create sample tables:

Create a new table named Date:

Date = CALENDAR(MIN('Sale'[DeliveryDate]),MAX('Sale'[DeliveryDate]))

Then create new measures:

FirstOrderDate = 
CALCULATE(
    MIN('Sale'[DeliveryDate]),
    ALLEXCEPT('Sale', 'Sale'[CustomerID], 'Sale'[SupplierID])
)

IsFirstOrderDateInContext = 
VAR minContextDate = MIN('Date'[Date])
VAR maxContextDate = MAX('Date'[Date])
RETURN
IF(
    [FirstOrderDate] >= minContextDate && [FirstOrderDate] <= maxContextDate,
    1,
    0
)

DistinctNewCustomers = 
CALCULATE(
    DISTINCTCOUNT('Customer'[CustomerID]),
    FILTER(
        'Customer',
        [IsFirstOrderDateInContext] = 1
    )
)

Put these measures in table visual, here is my preview:

How to Get Your Question Answered Quickly

Best Regards

Yongkang Hua

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.