Returns first non blank date.
The name of a column containing dates or a one column table containing dates.
The dates argument can be any of the following:
- A reference to a date/time column. Only in this case a context transition applies because the column reference is replaced by
- A table expression that returns a single column of date/time values.
- A Boolean expression that defines a single-column table of date/time values.
The result table includes only dates that exist in the dates column.
Learn more about FIRSTDATE in the following articles:
Semi-Additive Measures in DAX
Values such as inventory and balance account, usually calculated from a snapshot table, require the use of semi-additive measures. In Multidimensional you have specific aggregation types, like LastChild and LastNonEmpty. In PowerPivot and Tabular you use DAX, which is flexible enough to implement any calculation, as described in this article. » Read more
Other related functions are:
Contributors: Alberto Ferrari, Marco Russo
MSDN documentation: https://msdn.microsoft.com/en-us/query-bi/dax/firstdate-function-dax