From 83792f7509ea37f686e8cb574f4b1063de7880c0 Mon Sep 17 00:00:00 2001
From: koding88 <duongngocanh2k03@gmail.com>
Date: Mon, 24 Aug 2026 23:04:24 +0700
Subject: [PATCH] fix(locale): Maldivian weekStart out of range

weekStart must be within 0..6; the value 7 only behaved like a
Sunday start by accident of the week gap arithmetic. Per CLDR,
the week in the Maldives starts on Sunday.

Fixes #1535
---
 src/locale/dv.js       |  2 +-
 test/locale/dv.test.js | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 test/locale/dv.test.js

diff --git a/src/locale/dv.js b/src/locale/dv.js
index 897d7af04..70bdc287e 100644
--- a/src/locale/dv.js
+++ b/src/locale/dv.js
@@ -5,7 +5,7 @@ const locale = {
   name: 'dv',
   weekdays: 'އާދިއްތަ_ހޯމަ_އަންގާރަ_ބުދަ_ބުރާސްފަތި_ހުކުރު_ހޮނިހިރު'.split('_'),
   months: 'ޖެނުއަރީ_ފެބްރުއަރީ_މާރިޗު_އޭޕްރީލު_މޭ_ޖޫން_ޖުލައި_އޯގަސްޓު_ސެޕްޓެމްބަރު_އޮކްޓޯބަރު_ނޮވެމްބަރު_ޑިސެމްބަރު'.split('_'),
-  weekStart: 7,
+  weekStart: 0,
   weekdaysShort: 'އާދިއްތަ_ހޯމަ_އަންގާރަ_ބުދަ_ބުރާސްފަތި_ހުކުރު_ހޮނިހިރު'.split('_'),
   monthsShort: 'ޖެނުއަރީ_ފެބްރުއަރީ_މާރިޗު_އޭޕްރީލު_މޭ_ޖޫން_ޖުލައި_އޯގަސްޓު_ސެޕްޓެމްބަރު_އޮކްޓޯބަރު_ނޮވެމްބަރު_ޑިސެމްބަރު'.split('_'),
   weekdaysMin: 'އާދި_ހޯމަ_އަން_ބުދަ_ބުރާ_ހުކު_ހޮނި'.split('_'),
diff --git a/test/locale/dv.test.js b/test/locale/dv.test.js
new file mode 100644
index 000000000..46ff3830a
--- /dev/null
+++ b/test/locale/dv.test.js
@@ -0,0 +1,29 @@
+import MockDate from 'mockdate'
+import dayjs from '../../src'
+import '../../src/locale/dv'
+
+beforeEach(() => {
+  MockDate.set(new Date())
+})
+
+afterEach(() => {
+  MockDate.reset()
+})
+
+it('Maldivian week starts on Sunday (weekStart must be within 0..6)', () => {
+  const { weekStart } = dayjs().locale('dv').$locale()
+  expect(weekStart).toBe(0)
+
+  // every day of the week belongs to a week that starts on Sunday
+  for (let i = 0; i < 7; i += 1) {
+    const day = dayjs('2024-06-16').add(i, 'day') // 2024-06-16 is a Sunday
+    expect(day.locale('dv').startOf('week').day()).toBe(0)
+    expect(day.locale('dv').endOf('week').day()).toBe(6)
+  }
+})
+
+it('Sunday itself is the first day of its week in dv locale', () => {
+  const sunday = dayjs('2024-06-16').locale('dv')
+  expect(sunday.startOf('week').format('YYYY-MM-DD')).toBe('2024-06-16')
+  expect(sunday.endOf('week').format('YYYY-MM-DD')).toBe('2024-06-22')
+})