# DateDifferenceDays (DateTime)
| **Name** | ***DateDifferenceDays*** |
| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Syntax | DateDifferenceDays (Date leftDate, Date rightDate) |
| Purpose | To compute the difference between the specified dates in days. |
| Description | Subtracts a date time value from another date time value and returns result in days. |
| Return Type | Double |
| Parameters |
leftDate \[System.DateTime] – Date from which the other date will be subtracted
rightDate \[System.DateTime] – Date which will be subtracted
|
**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
In the output window, you can see that the provided datetime values have been subtracted, and the output has been displayed in the form of days.
