Xiaomi
Set Start of Week in Calendar auf Xiaomi
The Xiaomi Calendar app picks the first day of the week automatically based on your phone region. That is why some users see Monday as the start while others get Sunday or Saturday by default, without ever changing a setting themselves.
This regional default does not always match personal habits or work schedules. If your team plans weeks starting Monday but your calendar grid starts on Sunday, every weekly view looks shifted and makes quick date comparisons harder.
You can override the region default directly inside the app. Open Calendar ➔ Open the Menu ➔ Tap on Settings ➔ Tap on General ➔ Tap on Start of the week, then choose Saturday, Sunday or Monday.
The change applies instantly to the monthly and weekly grid views. Existing events keep their dates and times; only the column order in the calendar layout changes.
If you use a separate calendar app synced with your Google or Xiaomi account, check that app's own settings too, since this option only affects the built-in Calendar app on Android with MIUI.