kendo.timezones.js is generated from an outdated IANA tz database. The Canadian zones that moved to permanent standard time still observe DST in Kendo, so dates are off by one hour.

Reproduction

kendo.timezone.offset(new Date("2026-12-01T12:00:00Z"), "America/Vancouver");

Current: 480 for Vancouver, 420 for Edmonton, 360 for Winnipeg (DST rule Canada still applies).

Expected (tzdata 2026b-2026e, latest 2026f): 420 for Vancouver, 360 for Edmonton, 300 for Winnipeg. America/Inuvik is also affected (-06).

Bug report

Reproduction of the problem

If the title of the View is not initially set and setOptions method is used then the views in the Scehduler toolbar are displayed with: 'kendo.ui.DayView', 'kendo.ui.WorkWeekView', 'kendo.ui.WeekView'...

Open the Dojo - https://dojo.telerik.com/dCcHVbSb

Current behavior

Expected/desired behavior

The default titles should be displayed even after setOptions is used.

Environment

• Kendo/Telerik version: 2026.3.1015
• Browser: [all ]

Bug report

Recurring events are not rendered on the correct date when an event has to be displayed on different dates in different time zones.

Reproduction of the problem

1. In our demos or the Dojo linked here create an event with starting time of 09 AM. Set the event to repeat every Monday. In the example below the timezone of the machine and the event is UTC +2 (Sofia)

Below are two events recurring and nonrecurring created with the same starting date and time in UTC +2

1. To simulate opening in different time zones change the Timezone on the machine with a difference of more than -9 hours, so the event to be expected to display on the previous day. For example, select UTS -10 Hawaii.

Current behavior

After changing the time zone on the machine from UTC +2 to UTC -10 the event is rendered at 8 PM, but it is still displayed on Monday. Thus, recurring and non-recurring events created with the same start date and time are displayed on different days when the time zone is changed:

Expected/desired behavior

The date of the recurring event should be changed according to the time zone. It should be possible to repeat events on a different days of the week when the Scheduler is opened at different timezone

Environment

• Kendo UI version: 2022.2.512
• Browser: [all ]

1. Open Timeline view in jQuery Scheduler Widget Demo | Kendo UI for jQuery (https://demos.telerik.com/kendo-ui/scheduler/timeline) 

2. Edit in Kendo UI Dojo

3. Edit an event using the scheduler's event editor so that it is multi day, begins a week prior and ends at the start of the second day of a week at the time of a work day (Event: 06/02/2025 8AM - 06/10/2025 8 AM) (see attached screenshot)

4. Switch to "Work hours" instead of "Full day" view

=> The event is incorrectly displayed, missing a whole day.

Device : Windows 10 tablet

Browser : Latest Chrome and Edge

When trying to move an event vertically inside the scheduler, the entire web page is scrolling. This cause the event to not move has supposed to.

The problem can be exprienced on the demo page of the scheduler : https://demos.telerik.com/kendo-ui/scheduler/move-resize

Thank you

Bug report

Setting a required validation message for a date field through the model has no effect.

Reproduction of the problem

1. Open this Dojo example - https://dojo.telerik.com/iviweSOr/6
2. Edit an event
3. Clear the start/end field and try to save.

Current behavior

The custom validation message is not applied.

Expected/desired behavior

You should be able to change the message through the model

Environment

• Kendo UI version: 2022.2.510
• Browser: [all]

Bug report

Reproduction of the problem

1. Open and run the Dojo - https://dojo.telerik.com/OXSpsxQu

Current behavior

The segmented control for the views is displayedin the toolbar, although the Scheduler uses a custom toolbar configuration and the Segmented control is not added there.

Expected/desired behavior

Only componentes listed in the toolbar configuration should be displayed

Workaround:

    .k-scheduler-toolbar > .k-toolbar-views-dropdown,
    .k-scheduler-views.k-segmented-control {
        display: none !important;
    }

The issue is a regression starting with 2026.3.811.

Environment

• Kendo/Telerik version: 2026.3.811
• Browser: [all ]

Hi, we're using scheduler and we have the selectable set to true so users can drag and select timeslots to create.

The issue we're having is related to the autoscrolling when the user attempts to create a selection that is longer than the display window and attempts to drag past the display window but the scheduler would not auto scroll to expand the selection.

However, if we were to expand an existing event, the handler would be able to expand past the display window and scheduler would auto scroll. We were wondering if the event creation could have the same behavior.

Thanks,

Kenneth 

Bug report

Reproduction of the problem

Dojo example.

1. Run the example

Current behavior

The event in the first Scheduler is misaligned.

Expected/desired behavior

The events in all Schedulers are properly aligned.

Environment

• Kendo UI version: 2020.2.513
• jQuery version: x.y
• Browser: [all]

Bug report

When using the resize method the Scheduler's current time marker is not resized

Reproduction of the problem

1. Run this dojo from this KB
2. Note the horizontal scrollbar in the scheduler. For better representation collapse the Scheduler pane

Current behavior

The current time marker is not resized, screenshot for better representation:

Expected/desired behavior

The current time marker should be resized when using the resize() method

Environment

• Kendo UI version: 2020.2.1023
• Browser: [all]

Bug report

In a scenario when an event is dragged and is not saved due to an error while updating, or in case saving is prevented, next time when the user tries to drag the same event, the event hint will be misplaced.

Reproduction of the problem

1. Open one of the following Dojo examples:

• https://dojo.telerik.com/@NeliKondova/EZisicuk
• https://dojo.telerik.com/@NeliKondova/UMUtOPET

1. Try to drag the same event multiple times

Current behavior

The second time the same event is being dragged its hint is rendered in a wrong place. In case the same event is dragged multiple times, the hint is getting more and more away from the original position.

Expected/desired behavior

The event hint should always be rendered starting from the event's position.

Environment

• Kendo UI version: 2021.2.616
• Browser: [all ]

Bug report

The Scheduler, configured to import/export to iCal file, exports invalid file in Firefox.

Reproduction of the problem

1. Open the Scheduler demo in Firefox - https://dojo.telerik.com/@martin.tabakov@progress.com/UtIqiTaC
2. Hit the Export to iCal button.
3. Try opening the file in Outlook.

Workaround - https://dojo.telerik.com/UjOVoYUT/2

Current behavior

The exported file is invalid and cannot be opened in Outlook or other apps

Expected/desired behavior

The exported file should be valid and be opened in Outlook.

Environment

• Kendo UI version: 2021.2.512
• Browser: [Firefox]

Bug report

When the Scheduler is opened on iOS device in desktop mode it could not be scrolled easily, the scrolling is not smooth.

Reproduction of the problem

1. Open the demos - https://demos.telerik.com/kendo-ui/scheduler/timeline in Safari on iOS mobile device
2. Set the Safari browser to be in Desktop mode.
3. Try to scroll

Current behavior

The scrolling in Scheduler component is not very smooth on iOS desktop mode.

Expected/desired behavior

The Scheduler Timeline viwes should scroll as expected on iOS devices in Desktop mode.

Environment

• Kendo UI version: 2023.1.117
• Browser: [all]

Bug report

When the YearView in Scheduler is opened on iOS device in desktop mode it could not be scrolled

Reproduction of the problem

1. Open the demos - https://demos.telerik.com/kendo-ui/scheduler/yearview in Safari on iOS mobile device
2. Set the Safari browser to be in Desktop mode.
3. Try to scroll

Current behavior

The Scheduler in Year View could not be scrolled.

Expected/desired behavior

The Scheduler should be scrolled in iOS in both - mobile and desktop modes.

Environment

• Kendo UI version: 2022.3.913
• Browser: [ iOS XX Safari ]

Bug report

When date grouping is enabled in the Agenda view and the groups have different count off events, an incorrect event is returned in the change event hanlder.

Reproduction of the problem

1. Open the Dojo or Dojo 2
2. Click on an event in the last column

Current behavior

1. An alert with the id of the event should appear. However, currently wrong id that belongs to a different event is displayed.

Expected/desired behavior

The correct id of the selected event schould be returned in the change event hanlder.

Environment

• Kendo UI version: 2022.3.913
• Browser: [all]

Describe the bug
When there is an event that lasts multiple days, but is not an all-day event the title and the up arrow overlap, thus it makes the reading of the title harder.

To reproduce
Open the Dojo - https://dojo.telerik.com/@NeliK/IruYeGEc

Expected behavior
The arrow and the title should be rendered with some margin

Screenshots

Workaround

 .k-event-template{
      margin-top: 8px !important;
    }

Affected package (please remove the unneeded items)

• theme-default
• theme-bootstrap
• theme-material
• theme-tasks

Affected suites (please remove the unneeded items)

• Kendo UI for jQuery
• Kendo UI for Angular
• Kendo UI for React
• Kendo UI for Vue

Affected browsers (please remove the unneeded items)

• All

Please investigate this dojo sample:

https://dojo.telerik.com/IjIminuv

Even looking at the built-in Timeline view, one can see that the bottom gap is thinner in every group. However, switching to the TimelineEx view (that sets BottomRowOffset to 0), the problem is obvious...

Please address this computation error in the row-height...

Regards

Bug report

If a Scheduler event's start time is set differently than :00 or :30, the event will be dropped in an incorrect slot when snap is enabled. The start time in the hint is also incorrect.

Reproduction of the problem

1. Open this Dojo example - https://dojo.telerik.com/oSaQUCOp/13
2. Drag the event to 2:00 AM and drop it. Notice that the start time in the hint is also incorrect when the event is over the 2:00 AM slot.
3. Drop the event

Current behavior

The event will be placed at 2:19 AM instead of at 2:00 AM

Expected/desired behavior

The event should be placed at the dropped slot.

Environment

• Kendo UI version: 2024.1.319
• Browser: [all]

Bug report

Reproduction of the problem

1. Run this dojo - https://runner.telerik.io/fullscreen/aKRBlRDR
2. Quickly change the views in no particular order

Current behavior

Occasionally the k-focus class is not cleared from a previously selected view.

Expected/desired behavior

The k-focus class should be cleared

TicketID:

1715639

Environment

• Kendo/Telerik version: 2026.2.520