# DateDifferenceMonths (DateTime)

| **Name**    | ***DateDifferenceMonths***                                                                                                                                |
| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Syntax      | DateDifferenceMonths (Date leftDate, Date rightDate)                                                                                                      |
| Purpose     | To compute the difference between the specified dates in months.                                                                                          |
| Description | Returns difference between the specified dates in months by dividing number of days by 30.4375.                                                           |
| Return Type | Double                                                                                                                                                    |
| Parameters  | <p>leftDate \[System.DateTime] – Date from which the other date will be subtracted</p><p>rightDate \[System.DateTime] – Date which will be subtracted</p> |

![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/0%20\(218\).png)

**Example**

In this example, we will pass date time values to be subtracted to the function transformation object using a *Variables* object.

Where,

*leftDate* = 01/01/2023

*rightDate* = 01/02/2022

<figure><img src="https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/1%20(218).png" alt=""><figcaption></figcaption></figure>

In the output window, you can see that the difference between the provided datetime values has been displayed in the form of months.

![](https://github.com/astera-software/Astera_Data_Stack_v9/blob/main/.gitbook/assets/2%20\(216\).png)