# All-day events created on macOS are shifted one day backwards on other clients

**URL:** <https://forum.emclient.com/t/all-day-events-created-on-macos-are-shifted-one-day-backwards-on-other-clients/120601>\
**Category:** Calendar\
**Created:** [November 12, 2026, 10:26am UTC](https://forum.emclient.com/t/all-day-events-created-on-macos-are-shifted-one-day-backwards-on-other-clients/120601 "2026-11-12T10:26:07Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![gerolsteiner](https://forum.emclient.com/user_avatar/forum.emclient.com/gerolsteiner/32/20791_2.png) [@gerolsteiner](https://forum.emclient.com/u/gerolsteiner)\
**Post date:** [November 12, 2026, 10:26am UTC](https://forum.emclient.com/t/all-day-events-created-on-macos-are-shifted-one-day-backwards-on-other-clients/120601/1 "2026-11-12T10:26:08Z")

</div>

I’m experiencing an issue with the latest eM Client version on macOS when creating all-day calendar events.

When I create an all-day event using eM Client on macOS, the event initially appears to have the correct date. However, when I view the same event in other clients, it is shifted one day backwards.

This happens when viewing the event in:

- eM Client for Windows
- Kerio Connect Webmail
- Microsoft Outlook

Interestingly, all-day events created using eM Client on Windows are displayed correctly across all clients.

Environment:

- eM Client 11.0.1577.0 on macOS
- eM Client 11.0.1577.0 on Windows
- Kerio Connect

What I have investigated so far:

1. An all-day event created on the Mac is initially exported to a local ICS file with the correct dates:

2. However, when exporting the same event later from eM Client on Windows, the event already contains November 11 instead of November 12.

3. This suggests that the date shift is not simply a display issue. It appears to happen either when the event is saved to the server or when it is retrieved through the synchronization interface.

4. I also checked the EWS request sent by the Mac. It contains the correct date and `IsAllDayEvent=true`.

Current status:

The exact cause is still unclear. Unfortunately, the log excerpt I most recently examined did not contain the relevant EWS operation for creating or retrieving the event, so I cannot yet determine exactly where the date is being changed.

Has anyone else experienced this issue with all-day events created on macOS? Could this be related to how eM Client handles all-day events or date/time conversion when communicating with Kerio Connect via EWS?

Any help or suggestions would be greatly appreciated.