How to Change Working Time in Microsoft Project

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Here’s how to do it:

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1. Navigate to the 'Project' tab in the ribbon menu.
2. Click on 'Change Working Time' from the dropdown options.
3. In the 'Change Working Time' dialog box, you can create a new calendar by clicking 'Create New Calendar'.
4. Give your new calendar a descriptive name and click 'OK'.
5. Select the 'Work Weeks' tab to modify your working time pattern.
6. Choose the day(s) you want to modify, then select 'Set day(s) to these specific working times'.
7. Enter your desired start and finish times for each working period.
8. Click 'OK' to apply and save your working time changes to the project calendar.