Here’s the clear, problem-solving guide for how to change working days in Microsoft Project:
- Let's change your project's working days by first clicking on the 'Project' tab in the ribbon menu.
- Now, look for and select 'Change Working Time' from the dropdown menu. This is where we control working days and exceptions.
- In the 'Change Working Time' dialog box that appears, you can either modify the current calendar or create a new one with your desired working days.
- If creating a new calendar, give it a descriptive name that reflects your working schedule and click 'OK'.
- Now, navigate to the 'Work Weeks' tab where you can customize which days are working days and which are non-working.
- Select the day you want to change, then choose 'Set day(s) to these specific working times' to mark it as a working day.
- For each newly designated working day, enter the working hours you want to apply.
- Click 'OK' to save your changes. Your project schedule will now recalculate based on your newly defined working days.



