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Select the report, and copy it (using the Copy button).
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Give the copied version a new name (double-click on the name and type the new one in).
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With the renamed report selected, click the Edit button.
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In the Report Editor, select the date field that you want to change (in the example below, the field is called [ReportEventStartDate]).
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Under the Label Tasks section, look for Text Format String, and select the three dots to the right.
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You'll see the window below open up.
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With the DateTime category selected on the left, click on Types on the right, and scroll to see different options.
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The Preview window shows you how your choice will appear.
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Once you're happy with your choice, click OK to save the new string.
If you have more than one Date field in your report, you'll need to repeat this process.