Added new kb article retrieve-last-day-of-month-telerik-reporting (#1736)

* Added new kb article retrieve-last-day-of-month-telerik-reporting

* Update retrieve-last-day-of-month-telerik-reporting.md

* Update retrieve-last-day-of-month-telerik-reporting.md

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Co-authored-by: KB Bot <[email protected]>
Co-authored-by: IvetNikolova <[email protected]>
Co-authored-by: Dimitar Nikolov <[email protected]>

Author: 4 people

knowledge-base/retrieve-last-day-of-month-telerik-reporting.md

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+---
+title: Retrieve Last Day of Month for Specified Date
+description: Learn how to retrieve the last day of the month for a specified date parameter
+type: troubleshooting
+page_title: Formula to Get Last Day of Month Using Date Parameter in Telerik Reporting
+meta_title: Formula to Get Last Day of Month Using Date Parameter in Telerik Reporting
+slug: retrieve-last-day-of-month-telerik-reporting
+tags: reporting, datetime, parameters, formula, expressions
+res_type: kb
+ticketid: 1690706
+---
+
+## Environment
+
+<table>
+    <tbody>
+        <tr>
+            <td>Product</td>
+            <td>Progress® Telerik® Reporting</td>
+        </tr>
+        <tr>
+            <td>Version</td>
+            <td>19.1.25.521</td>
+        </tr>
+    </tbody>
+</table>
+
+## Description
+
+To obtain the last day of the month for a given [DateTime](https://learn.microsoft.com/en-us/dotnet/api/system.datetime) parameter, use the following formula. For instance, if the parameter date is `"2025-06-17"`, the formula will return `"2025-06-30"`.
+
+## Solution
+
+To calculate the last day of the month for a specified date parameter (`Parameter1`), use the following formula:
+
+`= Parameters.Parameter1.Value.AddDays(CDbl(1 - Parameters.Parameter1.Value.Day)).AddMonths(0).AddMonths(1).AddDays(CDbl(-1))`
+
+>note The fields of the data source component can also be used in the expression as long as they are a [DateTime](https://learn.microsoft.com/en-us/dotnet/api/system.datetime).
+
+### Explanation
+
+1. Replace `Today()` with your parameter value, such as `Parameters.Parameter1.Value`, in the formula.
+1. The formula calculates the first day of the next month and subtracts one day to get the last day of the current month.
+
+### Example
+
+Suppose the parameter `Parameter1` has a value of `"2025-06-17"`. The formula will produce `"2025-06-30"`. 
+
+## See Also
+
+* [Date and Time Functions]({%slug telerikreporting/designing-reports/connecting-to-data/expressions/expressions-reference/functions/date-and-time-functions%})