When invigilating a written exam, the usual practice is to project a clock to in front of the exam room so the students know how much time they have left.
Every time I needed a online clock that is simple and does not show ads, I have to scramble to google for it.
This is a simple clock written with HTML/CSS/JS created for this purpose. I just need a simple clock that I can use.
GitHub repository: https://github.com/lawkimchuan/clock