Microsoft says Windows’ Secure Lock screen clock deliberately runs up to 30 seconds behind

Microsoft says Windows’ Secure Lock screen clock deliberately runs up to 30 seconds behind

By Simon Batt
Publication Date: 2026-04-10 02:15:00

Summary

  • Windows’ Secure Lock clock can lag up to 30 seconds behind real time; Microsoft says it’s intentional.
  • It only affects the Secure Lock screen; system time, logs, and authentication stay accurate.
  • Behavior is by design: Secure Lock polls every 30s under SYSTEM, so updates may miss minute boundaries.

Windows can be a weird beast. Sometimes it’ll have a bug that stops people from using Windows in the strangest ways, and sometimes it’ll have bugs that feel more like features. However, sometimes people will report a bug in Windows, only for Microsoft to look at it and say, “Oh, no, that’s how that’s meant to work. No bugs here.”

Such is…