Can anyone make a clock you can set, or adjust manually? That why you can set it a few minutes ahead of time. Some people like to set their clocks earlier as a method to stay on time to things. 2-3 minutes usually ahead, or even behind if that would be useful to anyone.
Each clock app gets the time it displays from the server (adjusted for time zone, etc). In order for any clock app to display an offset time (ahead or behind) the app would need a “offset time by X minutes” feature added. It wouldn’t be necessarily be difficult to do but it’d have to be added to whatever clock app you want to see it in. I doubt Tidbyt themselves would be willing to add a universal “offset all times for me by X minutes” for all apps you install.
Which clock do you want to have this feature ?