Minecraft version: 1.15.2
Forge version: 31.2.36
Environment: Singleplayer

Mod name: GUI Clock
Mod version: guiclock_1.15.2-2.0.jar

When "showRealTime" is enabled one more hour is being added, if it is 13:00 it shows up like 14:00. I tried deleting config files to recreate them and it didn't work.

Thanks for the mod :)

The real time is linked to your local pc's settings. I can't change this in the mod. Thanks nonetheless for submitting the bug report though!

Is this a bug related to Daylight Saving Time not being handled properly?

It doesn't seem to be it... we don't do it around here and all the settings related to DST are disabled...
Also, I tried removing all mods leaving only the Collective lib and the problem persisted...

After messing around with the time settings,I noticed that the error starts after October 17th. Before that day it works normally, but from there on the bug appears.

Have you tried bisecting to see whether the errant time difference persists starting in early 2020, and to see when exactly that ends?

I did it. before october 17th there is no error. after october 17th the error is there. no matter which time I set in between. It never ends.

Exactly at midnight. goes from 23:59 to 01:00. same when using am/pm format.

Do you know when (at what time) during October 17 does the clock jump (besides just going from 13:00 to 14:00)?