What does expires on mean? Is the expiration date on a coupon the last date to use it?

 What does expires on mean? Is the expiration date on a coupon the last date to use it?

If a product or coupon says expires on July 4, does that mean it is still good on July 4? Does that mean July 4 is the last day to use it? I have called a few places in regard to their coupons that say expires on, and the receivers have told me that it means the date is the last date to use the coupon. Now I won't be confused by the wording anymore.

If Newegg or TigerDirect has a deal that says expires on July 4, then that deal is good on the last day of July 4. July 4 is the last day to be eligible for that deal. The deal ends on midnight of July 4, because that is when July 5 begins. It ends on the midnight between July 4 and July 5. Check the fine print to see if they specify paciofic time or Eastern time. Many TigerDirect deals expire Eastern time, so 11 PM Pacific time would already be too late.