Compare and Format Start Date and End Date in SharePoint Item Style
This compares your Start Date and End Date and displays accordingly.
January 1, 2012 – January 1, 2013
Same Year, Different Month
January 1 – February 1, 2012
Same Year, Same Month, Different Day
January 1 – 5, 2012
Same Year, Same Month, Same Day
January 1, 2012
Simply copy the attached into your custom item style where you’d like the date span to appear.
This assumes you have some knowledge of item styles and just need to output your dates in this fashion. Please if you need further assistance just post your questions in the comments and I’ll reply as soon as possible. Thanks!