- Description: If you always had trouble with remembering important events then this Windows gadget is definitely for you. The Countdown Clock is a simple sidebar gadget that is able to remind you about all of those important dates. Whether its birthdays, holidays, deadlines, dates, this simple gadget can remind you about all of them. No more are the days when you are yelled at because of your forgetfulness. This gadget is a true lifesaver and it works quite simply. On its interface it displays the number of days, hours, minutes, and seconds until it finally reaches that date that you set up.