How to create a date index in DAX?

If you want to use the date to create a date index column you can use the following DAX:

MyDateIndex =
( YEAR ( MyDates[Date] ) * 10000 )
+ ( MONTH ( MyDates[Date] ) * 100 )
+ DAY ( MyDates[Date] )

So if the date is 31st July 2018 this create an index of 20180731.

You can also do the same in M in the Query Editor window.

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