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How to Calculate the Numeric Week of the Year from a Date

Discover how to calculate the numeric week of the year from a date/time field utilizing a numeric equation field in three simple steps.

Example Use Case

One potential business use case for calculating the week number of a date in a year could be in project management or scheduling. Let's say you're managing a project with multiple milestones or deadlines spread out over the course of the year.

By being able to determine the week number of a particular date, you can effectively track and communicate deadlines to team members.


To begin, knowledge of data tables and fields is necessary to follow along with the steps. 

Learn about tables and fields in the following articles: Working with Tables & About Fields

Prior understanding of equation fields and date/time fields will be beneficial before beginning this step-by-step process as well.

You can learn more about equations here in this article: About Equations. To learn about date/time fields, see this section of our Field Types article: Date/Time Fields 

To learn about numeric equation functions and settings, see our articles here: Numeric Equation Functions & Numeric Equation Settings


1.  Add a Date/Time Field to Your Data Table

First, we'll need a date/time field in our data table. For this article, a date/time field named "Due Date" will be used to track when different team member tasks are due. 


2.  Add a Equation Field to Your Data Table

Next, we'll add the Equation field to the same data table as the one utilized in the above step. We'll name this Equation field "Week Number".

The following field settings will need to be applied:

  • Equation Type: Numeric

  • Equation Editor: getDateWeek({Due Date})

    • Within the curly brackets of the function above, you'll want to make sure to input your date/time field's name.

  • You can leave the remaining settings as they are by default.


3.  Check the Equation Field's Values

Now, with the assumption that our records already contain date/time field values for the equation field to utilize, we can verify in the records view of the Builder that the numeric week of the year required is located in our equation field as values.


4.  Add an Additional Equation Field to Calculate for Weeks Starting on Monday (Optional)

Knack designates Sunday as the starting day of the week. However, many organizations begin their work week on Monday.

To address this, a solution can be implemented. Another equation field can be added to the same data table that utilizes the equation field/date field from the above steps. 

Within the equation editor of this additional equation field input:

getDateWeek({Due Date}+1)

Be sure to use the correct field name within the curly brackets.


And that's it! You now have the numeric week of the year to effectively track and communicate deadlines to team members. 🚀