How can the calendar field be modified in a SharePoint list?

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Go to the SharePoint list where you want to modify the calendar field.

Click on the gear icon located on the top right corner of the page and select List settings.

Under the Columns section, locate the calendar field that you want to modify and click on its name.

On the field settings page, you will see various options to modify the calendar field.

You can change the display name of the field, add a description, and modify the type of calendar. You can select from Gregorian, Hijri, Japanese Emperor, Korean Tangun, and Taiwan Calendar.

You can also modify the date and time format of the calendar field by selecting the appropriate option under the Format section.

Once you have made the required modifications, click on the OK button to save your changes.

Your modified calendar field will now be available on the SharePoint list.