> ## Documentation Index
> Fetch the complete documentation index at: https://help.dingtalk.io/llms.txt
> Use this file to discover all available pages before exploring further.

# DAYS360

> The DAYS360 function calculates the number of days between two dates based on a 360-day year (12 months of 30 days each). It is supported in multiple YiDA scenarios, such as forms, workflow design, and integration & automation. The function accepts the end date, start date, and an optional calculation method as parameters, and returns a number representing the days between the specified dates.

The **DAYS360** function calculates the number of days between two dates based on a 360-day year (12 months of 30 days each). DAYS360 calculates the result by counting the number of full months between the two dates, multiplying by 30, and then adding the remaining days of the start and end months as needed.

## Supported Product Scenarios

The DAYS360 function is supported in the following YiDA scenarios.

* Form (main table fields)
* Form (business association rules)
* Form (validation)
* Workflow design (validation rules)
* Workflow design (association actions)
* Integration & automation
* Workflow node
* Connector

## Format

```text theme={"theme":{"light":"github-light","dark":"github-dark"}}
DAYS360(end_date,start_date,method)
```

## Attribute Description

| **Attribute** | **Required** | **Description**                                                                                                                                                                                                                                                                                                                                                                                                                        |
| ------------- | ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| end\_date     | Yes          | The date object of the end time.                                                                                                                                                                                                                                                                                                                                                                                                       |
| start\_date   | Yes          | The date object of the start time.                                                                                                                                                                                                                                                                                                                                                                                                     |
| method        | No           | Specifies how to handle cases where the start date and end date fall in the same month. Values:<br />• **true**: Uses the European method for calculation.<br />• **false**: Uses the U.S. (NASD) method for calculation.<br />If left blank, the default is false.<br />**Note**: For example, when calculating the difference between 2023-01-01 and 2023-12-31, the U.S. method returns 360, while the European method returns 359. |

## Return Value

| **Return value type** | **Description**                                 |
| --------------------- | ----------------------------------------------- |
| Number                | The number of days between the specified dates. |

## Example

As shown below, use the `DAYS360()` function to get the number of days between two dates.

* European method

* U.S. method

## Try It

Returns the number of days between two dates.