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Build 19045.5912

Build 19045.5912: Windows Insider Release Preview Channel, May 2025. Seconds clock returns to the calendar flyout with a 30-day events view

In short

Windows 10 version 22H2 Insiders in the Release Preview Channel get a returning seconds clock, a 30-day calendar events view, GDI rendering fixes, updated operator profiles, and an account-sync fix.

Does it affect you? Applies to: Insiders in the Release Preview Channel who are running Windows 10, version 22H2.

Build
19045.5912

Microsoft publishes separate notes for this KB for Windows 10.

This is a test build for people in the Windows Insider Program. Features in it can change, be removed, or never reach regular Windows releases.

What changes

Fixes 3 changes

GDI/GDI+

2 items

For: Insiders on Windows 10 version 22H2

  • Some GB18030-2022 characters in plane 2 now render.1
    Fixes rendering of some GB18030-2022 characters in plane 2.
  • Some GB18030 characters no longer appear too wide, and the sample paragraph renders correctly.2
    Fixes the rendering width of some GB18030 characters and the rendering of the sample paragraph.

WinSaS

For: Insiders on Windows 10 version 22H2

  • Secondary accounts in European Economic Area markets are now acknowledged by Windows Account Sync Consent, addressing an issue that increased server load.3
    Fixes an issue affecting the Windows Account Sync Consent system in European Economic Area markets.

Improvements 3 changes

Calendar flyout

2 items

For: Insiders on Windows 10 version 22H2

  • The calendar flyout brings back a clock view that displays seconds.4
  • The rich calendar shows upcoming events for up to 30 days.5

Mobile Operator Profiles

For: Insiders on Windows 10 version 22H2

  • Country and mobile operator settings profiles are updated.6
    Country and Operator Settings Asset (COSA) profiles are updated.

New feature 1 change

Calendar flyout

For: Insiders on Windows 10 version 22H2

  • The weather button on the rich calendar now has description text.7

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2025-05-15
Type
Windows Insider build
VersionBuildChannel
— 19045.5912 Release Preview Channel

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (7)
  1. 1. Fixed: Some GB18030-2022 characters in plane 2 are not rendered. blogs.windows.com
  2. 2. Fixed: Some GB18030 characters are rendered wider. Additionally, the sample paragraph is not rendered correctly. blogs.windows.com
  3. 3. Fixed: An issue affecting the Windows Account Sync Consent system in European Economic Area markets, where secondary accounts were not acknowledged, leading to increased server load. blogs.windows.com
  4. 4. Brings back the clock view that displays seconds onto the calendar that was once removed. blogs.windows.com
  5. 5. Enhances the Rich Calendar feature by extending the upcoming events period to 30 days. blogs.windows.com
  6. 6. Updated: Country and Operator Settings Asset (COSA) profiles are updated. blogs.windows.com
  7. 7. Adds description text for the weather button on the rich calendar. blogs.windows.com
Checked automatically: 8 of 8 checks passed, 7 quoted passages
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake