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If the date and time displayed on the taskbar are incorrect or in the wrong format, you can change them:
- Go to the Desktop and start typing Settings. 
- Click on Settings. 
- Click Date & Time in the sidebar to open the panel. 
- If you have the Automatic Date & Time switch set to on, your date and time should update automatically if you have an internet connection. To update your date and time manually, set this to off. 
- Click Date & Time, then adjust the time and date. 
- You can change how the hour is displayed by selecting 24-hour or AM/PM for Time Format. 
You may also wish to set the timezone manually.