How can I change the calendar in Microsoft Planner so the week starts on Monday?

Question

How can I change the calendar in Microsoft Planner so the week starts on Monday?

James Clarke 20

When I use Microsoft Planner the calendar view shows the week starting on Sunday, which is the end of the week.

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How can I change the settings so that the week starts on Monday? I have looked in the settings and I can see that under "regional format" under language and time zones you can change other calendar details such as time zones and date format (21/5/26 v 5/21/26 etc) but there does not seem to be any option to either start the week on a Monday or not show weekends, which I can do in the calendar in Outlook, for example.

When I first started using Planner the week did begin with Monday but it changed at some point.

Some of my colleagues still have a calendar view with the week starting on Monday, so this cannot be an organisation-wide admin setting.

I am using Planner in the Edge browser on a Windows 11 PC.

James Clarke 20 Reputation points

2026-05-21T09:06:16.5266667+00:00

I should add that some of my colleagues still have a calendar view with the week starting on Monday, so this cannot be an organisation-wide admin setting.

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James Clarke 20 Reputation points

2026-05-21T09:06:16.5266667+00:00

I should add that some of my colleagues still have a calendar view with the week starting on Monday, so this cannot be an organisation-wide admin setting.

Answer 1

Liora D 18,930 Microsoft External Staff Moderator

Dear @James Clarke,

I hope you’re having a good day.

To clarify first: in Microsoft Planner, there isn’t an option to directly control which day the week starts on. What you’re seeing is actually by design. Planner doesn’t manage this setting itself, it inherits it from your regional (locale) configuration, which can come from your Microsoft 365 profile or your browser/system environment.

That also explains why different users in the same organization can see different behavior.

Planner is currently picking up a region that uses Sunday as the first day of the week, most commonly: English (United States) > Sunday (default for many systems)

If your calendar used to start on Monday, it likely means something in your environment changed, for example your language/region in Microsoft 365, your browser settings, or even the device you’re using.

The most reliable way is to update your Microsoft 365 regional format, since that is what Planner typically follows.

To change these settings, navigate to your account’s Microsoft 365 language and region preferences, or adjust them directly in Teams under “Settings” > “General” > “App language”. Make sure you set it to a locale that starts the week on Monday. Restart Teams to confirm if your tasks now show Monday as the first day.

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So, for your scenario, switching from something like English (United States) to English (United Kingdom) will usually result in the week starting on Monday.

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I hope this helps clarify what’s happening and gets you back to a Monday-start week. Please feel free to reply below if you have any update or further concern.

Warm regards,

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

James Clarke 20 Reputation points

2026-05-21T11:02:43.95+00:00

Thank you for this very comprehensive answer @Liora D . Unfortunately what you've suggested hasn't worked. I already have my Microsoft 365 profile settings set to English (United Kingdom) which, from what you've suggested here, should mean that the calendar week would begin on a Monday. It does in Outlook and in Teams but not in Planner. I have tried changing it to another language setting and then back to English (United Kingdom) to see if that change prompts any update in the settings for Planner but nothing has changed.
Liora D 18,930 Reputation points Microsoft External Staff Moderator

2026-05-21T15:03:21.3766667+00:00
Hi @James Clarke,Thank you for testing that and for sharing the additional detail.

Since your Microsoft 365 profile is already set to English (United Kingdom) and you’re seeing Monday correctly in Outlook and Teams, but Planner is still showing Sunday, this confirms that the behavior is not fully aligned across apps and may depend on how Planner is reading settings in your browser session.

At this point, there are a couple of things you can try that specifically target how Planner is loaded in the browser:

Check and prioritize your browser language settings (Edge)

Planner (being web-based) may follow your browser’s language rather than your Microsoft 365 profile in some cases.

Open Edge Settings > Languages

Make sure English (United Kingdom) is listed and moved to the top

Restart the browser after making changes

Test Planner in a clean session (to rule out caching issues)

Sometimes the calendar behavior can be affected by cached preferences.

Open an InPrivate window (Ctrl + Shift + N)

Go to Planner and check the calendar view again

If the week starts on Monday in this mode, the issue is likely due to cached data in your normal session. In that case: Go to Settings > Privacy > Clear browsing data > Clear cookies and cached files > Reopen Planner and check again

Hopefully one of these adjustments helps align Planner with your expected Monday start.

Wishing you all the best with this, and please don’t hesitate to reach out if you have any updates or if something still doesn’t look right, I’ll be glad to assist further.
Liora D 18,930 Reputation points Microsoft External Staff Moderator

2026-05-22T14:46:02.8466667+00:00

Hi @James Clarke,

I just wanted to follow up to see how things are going with the information I shared above. I truly hope it was helpful and brought you closer to resolving the issue.

If you’ve had a chance to review it and have any updates, questions, or if you ran into any difficulties along the way, please don’t hesitate to let me know. I’m more than happy to assist further if needed.

It would be great to hear back from you!

Warm regards,

If my response has helped you better understand the situation and guided you toward a possible next step, please consider marking it as the “Accepted answer.” Doing so will pin the thread to the top, making it easier for others to discover your question and see the pioneering effort you have made in raising this issue. It also helps users searching with related keywords find the discussion more quickly and benefit from the insights shared.
James Clarke 20 Reputation points

2026-05-28T11:10:51.42+00:00

Hi @Liora D

I have just tried your suggestion of checking the Microsoft Edge language settings and found that US English was at the top of the list. So I changed it to put UK English at the top and that has resolved my issue. Planner now shows the calendar in the format I wanted, with Monday as the start of the week. Thank you so much for your help - I really appreciate it, and I also appreciate that you persevered when the initial suggestions didn't work.
Liora D 18,930 Reputation points Microsoft External Staff Moderator

2026-05-28T14:27:52.8733333+00:00

Hi James,

Thank you so much for coming back with the update.

I’m also glad to hear that Planner is now displaying the week starting on Monday as expected. And thank you as well for your patience in testing the different suggestions, I genuinely appreciate your persistence throughout the process.

Your feedback here will definitely be helpful for others who might run into the same situation.

Thanks again, and wishing you a great day!
mk-ard 0 Reputation points

2026-09-25T09:31:11.8966667+00:00

Hi @Liora D ,

this does not seem like a proper fix, merely a workaround... When I enable "Follow OS Settings", Teams should follow OS regional settings - which it mostly does (e.g. my Calendar module is displayed correctly), except from the Planner app (which follows browser language priorities).

So it almost seems like a bug of Planner app for Teams to me... What do we need to do to have this corrected?

Thanks!