Dax Function: EOMONTH
Category: Date and Time Functions
The EOMONTH function in Power BI is a DAX (Data Analysis Expressions) function that calculates the last day of a month after adding or subtracting a specified number of months to a given date.
Purpose
To determine the end-of-month date based on a given date and an offset in months.
Type of Calculations
Date manipulation for determining month boundaries.
Practical Use Cases
- Identifying the last day of a fiscal or calendar month for reporting.
- Calculating expiration dates for contracts or subscriptions.
- Aligning calculations to monthly periods for financial modeling or time-based analysis.
EOMONTH(<start_date>, <months>)
| Parameter | Type | Description |
|---|---|---|
start_date | Datetime | The initial date from which the calculation begins. Must be a valid datetime value. |
months | Integer | The number of months to add (positive) or subtract (negative) to determine the desired month. |
How Does EOMONTH Dax Function Works
- The function takes the
start_dateas the initial reference point. - It adjusts the
start_dateby the specifiedmonthsparameter (positive for future months, negative for past months). - The result is the last day of the calculated month.
Example: For start_date = 2025-01-15 and months = 1, the result is 2025-02-28.
What Does It Return?
- Type: Datetime.
- Meaning: Returns the date of the last day of the calculated month.
When Should We Use It?
- Defining monthly reporting periods based on a given date.
- Automating month-end calculations for financial or operational processes.
- Creating dynamic end-of-month date ranges for time-series analysis.
Examples
Basic Usage
Calculate the end of the current month:
EOMONTH(TODAY(), 0)
Output: The last day of the current month.
Column Usage:
Add a calculated column to determine the end of the month for each date in a column:
MonthEndDate = EOMONTH(Table[OrderDate], 0)
For OrderDate = 2024-07-10, the result is 2024-07-31.
Advanced Usage
Combine with DATEDIFF to calculate the days remaining in the month:
DaysRemaining = DATEDIFF(TODAY(), EOMONTH(TODAY(), 0), DAY)
This returns the number of days left in the current month.
Tips and Tricks
- Combine with EDATE to create flexible date calculations that span across months.
- Use EOMONTH to normalize dates to the end of the month for consistent period analysis.
- Be cautious with non-date inputs for
start_date. UseDATEVALUEorDATEto ensure proper formatting.
Potential Pitfalls
- Non-date inputs for
start_datewill cause errors. Ensure all dates are valid. - Be mindful of leap years when calculating month ends, although the function automatically handles these.
Performance Impact of EOMONTH DAX Function:
- Works efficiently with large datasets, even when used in calculated columns or measures.
- Precomputing dates in Power Query can reduce performance overhead for complex models.
Related Functions You Might Need
- EDATE: Adds or subtracts months from a given date but does not adjust to the end of the month.
- DATE: Constructs a date from individual components, useful for creating the
start_date. - TODAY: Provides the current date for dynamic date calculations.
- DATEDIFF: Calculates the difference between two dates in specified units.
Want to Learn More?
For more information, check out the official Microsoft documentation for EOMONTH. You can also experiment with this function in your Power BI reports to explore its capabilities.
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The EOMONTH function calculates the last day of a month after adding or subtracting a specified number of months from a given date.
The function automatically accounts for leap years, ensuring correct results for February.
Yes, by using a negative value for the months parameter.
The function will return an error. Ensure that start_date is a valid datetime value.
While both functions adjust dates by months, EOMONTH specifically returns the last day of the calculated month, whereas EDATE returns a specific day within the calculated month.
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