---
title: "DAYSDIFF_MXONB(A)"
slug: "engineeringdatefunction2-11"
updated: 2021-10-16T10:30:24Z
published: 2021-10-16T10:30:24Z
canonical: "docs.datajet.app/engineeringdatefunction2-11"
---

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

# DAYSDIFF_MXONB(A)

## Date Transform: DAYSDIFF_MXONB(A)

## Returns the number of days between Date A and the maximum value of Date B

## Purpose

Use this function to calculate:

- The number of days between a target date and a comparison date
- The number of days between one event and most recent occurrence of another event
- The age of a transaction in days relative to the total time covered by the data set

## Return Value

| Property | Value |
| --- | --- |
| **FieldType** | Integer |
| **FieldSize** | med |
| **DataType** | Discrete |
| **DataSize** | Short |

```shell
Example Return Value: -N.....N 
where 
N is the maximum number of days between Date A and the maximum of Date B
```

![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/DAYSDIFF_MX_Sample.PNG)

## Parameters

| Parameter | JSON | Description |
| --- | --- | --- |
| **Table** | “targetTable”: “MyTableName” | The target table on which the new field will be created |
| **Filter** | “dataset”: {DataSet_JSON} | Optional. If a filter is applied, records not in the filter Recordset will be returned as null. |
| **DateTimeFunction** | “p1”: “DAYSDIFF_MXONB(A,B)” | DAYSDIFF_MXONB(A,B) |
| **A** | “p2”: “DateTimeFieldName” “p2”: “DateFieldName” “p2”: “#YYYY-MM-DD HH:MM:SS” “p2”: “#YYYY-MM-DD” | Required. Date to subtract from B. *Supports:* - **DataType:** Discrete / Continuous - **Field Type:** Date, DateTime - **Fixed Value:** #YYYY-MM-DD, e.g. #2021-04-05 - **Fixed Value:** #YYYY-MM-DD HH:MM:SS, e.g. #2021-04-05 11:01:08 |
| **B** | “p3”: “DateTimeFieldName” “p3”: “DateFieldName” “p3”: “#YYYY-MM-DD HH:MM:SS” “p3”: “#YYYY-MM-DD” | Required. Date from which to calculate the maximum *Supports:* - **DataType:** Discrete / Continuous - **Field Type:** Date, DateTime - **Fixed Value:** #YYYY-MM-DD, e.g. #2021-04-05 - **Fixed Value:** #YYYY-MM-DD HH:MM:SS, e.g. #2021-04-05 11:01:08 |

## JSON Sample

![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/DAYSDIFF_MX_JSON.PNG)

## Usage Notes

See also [](https://datajet.document360.io/v1/docs/engineeringdatefunction2)

- [ABSDAYSDIFF(A,B)](https://datajet.document360.io/v1/docs/engineeringdatefunction2) - Absolute difference in days between dates A and B
- [DAYSDIFF(A,B)](/v1/docs/engineeringdatefunction2-10) - Difference in days between dates A and B
- [DAYSBEFOREMAX(A)](/v1/docs/engineeringdatefunction2-9) - Difference in days between A and MAX(A)
- [DAYSAFTERMIN(A)](/v1/docs/engineeringdatefunction2-8) - Difference in days between A and MIN(A)

## Example

| Example | Details |
| --- | --- |
| **Description** | Calculate days between transaction and most recent response in the system |
| **Input** | - Table: = [transactions] - Function: = DateTransform - **DateTimeFunction: =** - A:= [transactions].[date] - B: = [transactions].[last_response] - Name: = DaysDiffMaxOnLastResponse |
| **Sample** | ![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/DAYSDIFF_MX_Example.PNG) |