Hi - I've made a timer for Trijam because why not & I had a bit of free time. It's horribly undertested so don't trust it.
https://wish-22.github.io/time_tri
https://www.lexaloffle.com/bbs/?tid=52690&tkey=naCGiD9UuoWNr0iLM434
There's not any difference between the versions. Not really sure why I even put two versions up.
The left is for the time remaining until submissions close (or until the jam begins), and the right is your timer for creating assets.
CTRL-M to mute, Z to start and stop the timer. If you mess up your timer, you can hit ENTER and use the arrow keys to navigate to Reset Timer. (I should probably make it easier to change the time left at any time)
Trust the timer to save as well as the rest of your browser save data. It'll be better on your computer browser. It'll be even better in PICO-8 if you have that.
It should work okay for every weekend this year. Enjoy! if you want