Didn't realize it was so soon...go to your account preferences and right on the first page there's a box to check to 'Adjust for Daylight Saving Time'. I've had that box checked for years and from what I recall it always worked..listings ended when they were supposed to.
If you want to be extra cautious tho, make the listings for either a half hour earlier or later. That way if the box doesn't work the end time won't be off by too much.
Good luck
