---
title: "WEEKDAY(A)"
slug: "engineeringdatefunction2-18"
updated: 2021-10-15T16:12:19Z
published: 2021-10-15T16:12:19Z
canonical: "docs.datajet.app/engineeringdatefunction2-18"
---

> ## 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.

# WEEKDAY(A)

## Date Transform: WEEKDAY(A)

## Returns the weekday from Date A as an integer from 1 to 7, where 1=Monday

## Purpose

Use this function to:

- Create Date/Weekday mappings for use in mathematical formulas
- Group events into weekdays

## Return Value

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

```shell
Example Return Value: 1...7
```

![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/WEEKDAY_Sample(1).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”: “WEEKDAY(A)” | WEEKDAY(A) |
| **A** | “p2”: “DateTimeFieldName” “p2”: “DateFieldName” “p2”: “#YYYY-MM-DD HH:MM:SS” “p2”: “#YYYY-MM-DD” | Required. The date from which to extract the weekday *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/WEEKDAY_JSON.PNG)

## Usage Notes

See also:

- [SWEEKDAY(A)](/v1/docs/engineeringdatefunction2-17) - weekday as a string
- [SMONTH(A)](/v1/docs/engineeringdatefunction2-16) - month as a string
- WOY(A) - week of year

## Example

| Example | Details |
| --- | --- |
| **Description** | Group transactions by weekday of shipment |
| **Input** | - Table: = [transactions] - Function: = DateTransform - **DateTimeFunction: = WEEKDAY(A)** - A:= [transactions].[dtShipping] - Name: =ShippingWeekdayAsInt |
| **Sample** | ![](https://cdn.document360.io/73b6469b-c1e4-47e9-aa65-986c8ebd17ca/Images/Documentation/WEEKDAY_Example.PNG) |