Date position of right-click

Hi, I want to impliment a "Split event here" right-click menu item. The user would right click on the event, and then the code would change the end date of the current event then create a new even starting from the same date. Is there any way to detect the date where the user has right-clicked the event? For example, if there was an event from the 1st Aug - 20 Aug, and the user right-clicked on the 10th... can I see that? Thanks Alistair