Switch to standard time (from summer time) causes tasks to be shifted by one hour in the timeline

[gigalasr]

Please check that this issue hasn't been reported before.

• [x] I searched previous Bug Reports didn't find any similar reports.

Expected Behavior

A Task with a duration from x until y should show up from x until y in the timeline.

Current behaviour

However the task currently shows up at x-1 til y-1

Steps to reproduce

Set your time zone to Central European Standard Time (GMT+1) / MEZ

Which Operating Systems are you using?

• [ ] Android
• [ ] iPhone/iPad
• [x] Linux
• [ ] macOS
• [ ] Windows

Obsidian Version

1.9.14

Possible solution

No response

[brsma]

Same on macOS and iOS (Obsidian 1.10.1). Both previously created tasks and newly added tasks. ICS entries display correctly.

[gigalasr]

The Problem seems to arise from the use of window.moment.startOf('day') as this function returns the wrong Time Zone

and that is used

• here: https://github.com/ivan-lednev/obsidian-day-planner/blob/7239aa8842bbe6dd6babc5acc1070f4fb666741c/src/util/moment.ts#L10C1-L12C2
• and here: https://github.com/ivan-lednev/obsidian-day-planner/blob/7239aa8842bbe6dd6babc5acc1070f4fb666741c/src/ui/hooks/use-task-visuals.ts#L21C5-L23C37

to calculate the offset from the top

[gigalasr]

Oh I think this issue is only relevant today (and all future time switches). window.moment.startOf('day') correctly returns the summer time, because the start of this day was still in summer time! The switch happens at 03:00, so only after that the time zone will be standard time again.

[brsma]

It's back to normal today, indeed.

[GalladeGuy]

Getting this bug today (DST ended at 2 AM for most of the US). Not a big deal if it's only for a day, but it would be nice to have a fix for the future.

[Luthien22]

Having the same behavior today on Windows and iPad OS. I assume it's from the time change.