DAX Time Intelligence - FIRSTDATE function


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Description

Returns the first date in the current context for the specified column of dates.

Syntax

FIRSTDATE (<dates>) 

Parameters

Sr.No. Parameter & Description
1

dates

A column that contains dates.

Return Value

A table containing a single column and single row with a date value.

Remarks

The dates parameter can be any of the following −

  • A reference to a date/time column.

  • 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.

Constraints on Boolean expressions −

  • The expression cannot reference a calculated field.

  • The expression cannot use CALCULATE function.

  • The expression cannot use any function that scans a table or returns a table, including aggregation functions.

However, a Boolean expression can use any function that looks up a single value, or that calculates a scalar value.

When the current context is a single date, the dates returned by the DAX FIRSTDATE function and DAX LASTDATE function will be the same.

As DAX FIRSTDATE function returns a table that contains a single column and single value, it can be used as a parameter to any DAX function that requires a table in its parameters. Further, the returned value can be used wherever a date value is required.

Example

= FIRSTDATE (Sales [Date]) 
dax_functions_time_intelligence.htm

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