Use the Countdown timer web part - Microsoft Support
How to Add Countdown Timer on Windows 10 - GuruAid - YouTube
Free Countdown Timer - Download
FREE Countdown Timer for PC and MAC - YouTube
Free download Download Free Viewtimer Desktop Countdown Timer Viewtimer Desktop [613x346] for your Desktop, Mobile & Tablet | Explore 49+ Wallpaper Countdown Clock Free | Clock Wallpaper Free Windows 7, Free Countdown
Countdown Timer for Rainmeter by themagnumizer on DeviantArt
TimeLeft - Free clock, reminder, countdown, stopwatch, timer, sticker, auction watch and time synchronization utility using Winamp skins to show digits and text.