---
title: "Feature: #108463 - User-specific configuration of date-timepicker's first day of a week"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:feature-108463-1765370503"
source: "Changelog/14.1/Feature-108463-User-specificconfigurationofdate-timepickerstartofweek.rst"
typo3-version: "14.1"
typo3-major: 14
type: "feature"
issue: 108463
forge: "https://forge.typo3.org/issues/108463"
tags: ["Backend", "NotScanned", "ext:core"]
rendered: "2026-09-20T18:31:11+00:00"
---

# Feature: #108463 - User-specific configuration of date-timepicker's first day of a week {#feature-108463-1765370503}

See [forge#108463](https://forge.typo3.org/issues/108463)

## Description {#description}

Previously, the date-time picker used the selected locale of a backend user.

However, certain locale configurations might rather be a user preference.
For example, users may prefer an english backend but want to use a weekday
start on "Monday" instead of "Sunday" due to their cultural habits.

Thus, the "first day of a week" has been decoupled from the locale selection
and can be configured on a per-user setting. By default, it still inherits
the locale's default setting, if not changed (for example, english=sunday
and german=monday).

Inside the user settings and tab panel **Backend appearance**, a new dropdown
**First day of week in calendar popups** appears.

The setting is stored in both the persisted `be_users.uc` preference blob,
as well as on the JavaScript-persistence side.

## Impact {#impact}

Editors can now choose the first day of a week as a user preference, independent
from locale selection.