src/App.vue

@@ -1,36 +1,9 @@
 <script setup>
-import { ref } from 'vue'
 import CalendarView from './components/CalendarView.vue'
-import EventDialog from './components/EventDialog.vue'
-
-const eventDialog = ref(null)
-
-const handleCreateEvent = (eventData) => {
-  if (eventDialog.value) {
-    const selectionData = {
-      startDate: eventData.startDate,
-      dayCount: eventData.dayCount,
-    }
-    setTimeout(() => eventDialog.value.openCreateDialog(selectionData), 50)
-  }
-}
-
-const handleEditEvent = (eventInstanceId) => {
-  if (eventDialog.value) {
-    eventDialog.value.openEditDialog(eventInstanceId)
-  }
-}
-
-const handleClearSelection = () => {}
 </script>
 
 <template>
-  <CalendarView @create-event="handleCreateEvent" @edit-event="handleEditEvent" />
-  <EventDialog
-    ref="eventDialog"
-    :selection="{ startDate: null, dayCount: 0 }"
-    @clear-selection="handleClearSelection"
-  />
+  <CalendarView />
 </template>
 
 <style scoped></style>

src/components/CalendarGrid.vue

@@ -8,12 +8,7 @@
   </div>
   <div class="calendar-viewport" ref="viewportEl" @scroll="handleScroll">
     <div class="calendar-content" :style="{ height: `${totalVirtualWeeks * rowHeight}px` }">
-      <WeekRow
-        v.for="week in visibleWeeks"
-        :key="week.virtualWeek"
-        :week="week"
-        :style="{ top: `${(week.virtualWeek - minVirtualWeek) * rowHeight}px` }"
-      />
+      <WeekRow v.for="week in visibleWeeks" :key="week.virtualWeek" :week="week" :style="{ top: `${(week.virtualWeek - minVirtualWeek) * rowHeight}px` }" />
     </div>
   </div>
 </template>
@@ -21,15 +16,7 @@
 <script setup>
 import { ref, onMounted, onBeforeUnmount, computed } from 'vue'
 import { useCalendarStore } from '@/stores/CalendarStore'
-import {
-  getLocalizedWeekdayNames,
-  getLocaleWeekendDays,
-  getLocaleFirstDay,
-  isoWeekInfo,
-  fromLocalString,
-  toLocalString,
-  mondayIndex,
-} from '@/utils/date'
+import { getLocalizedWeekdayNames, isoWeekInfo, fromLocalString, toLocalString, mondayIndex } from '@/utils/date'
 import WeekRow from './WeekRow.vue'
 
 const calendarStore = useCalendarStore()
@@ -42,10 +29,10 @@ const visibleWeeks = ref([])
 const config = {
   min_year: 1900,
   max_year: 2100,
-  weekend: getLocaleWeekendDays(),
+  weekend: [true, false, false, false, false, false, true] // Sun, Mon, ..., Sat
 }
 
-const baseDate = new Date(1970, 0, 4 + getLocaleFirstDay())
+const baseDate = new Date(2024, 0, 1) // 2024 begins with Monday
 const WEEK_MS = 7 * 86400000
 
 const weekdayNames = getLocalizedWeekdayNames()
@@ -97,16 +84,13 @@ const updateVisibleWeeks = () => {
   const endIdx = Math.ceil((scrollTop + viewportH + buffer * rowHeight.value) / rowHeight.value)
 
   const startVW = Math.max(minVirtualWeek.value, startIdx + minVirtualWeek.value)
-  const endVW = Math.min(
-    totalVirtualWeeks.value + minVirtualWeek.value - 1,
-    endIdx + minVirtualWeek.value,
-  )
+  const endVW = Math.min(totalVirtualWeeks.value + minVirtualWeek.value - 1, endIdx + minVirtualWeek.value)
 
   const newVisibleWeeks = []
   for (let vw = startVW; vw <= endVW; vw++) {
     newVisibleWeeks.push({
       virtualWeek: vw,
-      monday: getMondayForVirtualWeek(vw),
+      monday: getMondayForVirtualWeek(vw)
     })
   }
   visibleWeeks.value = newVisibleWeeks
@@ -181,4 +165,5 @@ onMounted(() => {
 onBeforeUnmount(() => {
   document.removeEventListener('goToToday', goToTodayHandler)
 })
+
 </script>

src/components/CalendarHeader.vue

@@ -1,12 +1,12 @@
 <script setup>
 import { computed } from 'vue'
 import { useCalendarStore } from '@/stores/CalendarStore'
-import { getLocalizedWeekdayNames, reorderByFirstDay, isoWeekInfo } from '@/utils/date'
+import { getLocalizedWeekdayNames, isoWeekInfo, mondayIndex } from '@/utils/date'
 
 const props = defineProps({
   scrollTop: { type: Number, default: 0 },
   rowHeight: { type: Number, default: 64 },
-  minVirtualWeek: { type: Number, default: 0 },
+  minVirtualWeek: { type: Number, default: 0 }
 })
 
 const calendarStore = useCalendarStore()
@@ -14,22 +14,17 @@ const calendarStore = useCalendarStore()
 const yearLabel = computed(() => {
   const topDisplayIndex = Math.floor(props.scrollTop / props.rowHeight)
   const topVW = topDisplayIndex + props.minVirtualWeek
-  const baseDate = new Date(1970, 0, 4 + calendarStore.config.first_day)
-  const firstDay = new Date(baseDate)
-  firstDay.setDate(firstDay.getDate() + topVW * 7)
-  return isoWeekInfo(firstDay).year
+  const baseDate = new Date(2024, 0, 1) // Monday
+  const monday = new Date(baseDate)
+  monday.setDate(monday.getDate() + topVW * 7)
+  return isoWeekInfo(monday).year
 })
 
 const weekdayNames = computed(() => {
-  // Get Monday-first names, then reorder by first day, then add weekend info
-  const mondayFirstNames = getLocalizedWeekdayNames()
-  const sundayFirstNames = [mondayFirstNames[6], ...mondayFirstNames.slice(0, 6)]
-  const reorderedNames = reorderByFirstDay(sundayFirstNames, calendarStore.config.first_day)
-  const reorderedWeekend = reorderByFirstDay(calendarStore.weekend, calendarStore.config.first_day)
-
-  return reorderedNames.map((name, i) => ({
+  const names = getLocalizedWeekdayNames()
+  return names.map((name, i) => ({
     name,
-    isWeekend: reorderedWeekend[i],
+    isWeekend: calendarStore.weekend[(i + 1) % 7]
   }))
 })
 </script>
@@ -37,14 +32,7 @@ const weekdayNames = computed(() => {
 <template>
   <div class="calendar-header">
     <div class="year-label">{{ yearLabel }}</div>
-    <div
-      v-for="day in weekdayNames"
-      :key="day.name"
-      class="dow"
-      :class="{ workday: !day.isWeekend, weekend: day.isWeekend }"
-    >
-      {{ day.name }}
-    </div>
+    <div v-for="day in weekdayNames" :key="day.name" class="dow" :class="{ weekend: day.isWeekend }">{{ day.name }}</div>
     <div class="overlay-header-spacer"></div>
   </div>
 </template>
@@ -74,19 +62,14 @@ const weekdayNames = computed(() => {
   font-size: 1.2em;
   padding: 0.5rem;
 }
+
 .dow {
   text-transform: uppercase;
   text-align: center;
   padding: 0.5rem;
   font-weight: 500;
 }
-.dow.weekend {
-  color: var(--weekend);
-}
-.dow.workday {
-  color: var(--workday);
-}
 .overlay-header-spacer {
-  grid-area: auto;
+  /* Empty spacer for the month label column */
 }
 </style>

src/components/CalendarView.vue

@@ -4,39 +4,22 @@ import { useCalendarStore } from '@/stores/CalendarStore'
 import CalendarHeader from '@/components/CalendarHeader.vue'
 import CalendarWeek from '@/components/CalendarWeek.vue'
 import Jogwheel from '@/components/Jogwheel.vue'
-import {
-  isoWeekInfo,
-  getLocalizedMonthName,
-  monthAbbr,
-  lunarPhaseSymbol,
-  pad,
-  daysInclusive,
-  addDaysStr,
-  formatDateRange,
-} from '@/utils/date'
+import EventDialog from '@/components/EventDialog.vue'
+import { isoWeekInfo, getLocalizedMonthName, monthAbbr, lunarPhaseSymbol, pad, mondayIndex, daysInclusive, addDaysStr, formatDateRange } from '@/utils/date'
 import { toLocalString, fromLocalString } from '@/utils/date'
 
 const calendarStore = useCalendarStore()
 const viewport = ref(null)
+const eventDialog = ref(null)
 
-const emit = defineEmits(['create-event', 'edit-event'])
-
-function createEventFromSelection() {
-  if (!selection.value.startDate || selection.value.dayCount === 0) return null
-
-  return {
-    startDate: selection.value.startDate,
-    dayCount: selection.value.dayCount,
-    endDate: addDaysStr(selection.value.startDate, selection.value.dayCount - 1),
-  }
-}
-
+// UI state moved from store
 const scrollTop = ref(0)
 const viewportHeight = ref(600)
 const rowHeight = ref(64)
-const baseDate = new Date(1970, 0, 4 + calendarStore.config.first_day)
+const baseDate = new Date(2024, 0, 1) // Monday
 
-const selection = ref({ startDate: null, dayCount: 0 })
+// Selection state moved from store
+const selection = ref({ start: null, end: null })
 const isDragging = ref(false)
 const dragAnchor = ref(null)
 
@@ -44,18 +27,16 @@ const WEEK_MS = 7 * 24 * 60 * 60 * 1000
 
 const minVirtualWeek = computed(() => {
   const date = new Date(calendarStore.minYear, 0, 1)
-  const firstDayOfWeek = new Date(date)
-  const dayOffset = (date.getDay() - calendarStore.config.first_day + 7) % 7
-  firstDayOfWeek.setDate(date.getDate() - dayOffset)
-  return Math.floor((firstDayOfWeek - baseDate) / WEEK_MS)
+  const monday = new Date(date)
+  monday.setDate(date.getDate() - ((date.getDay() + 6) % 7))
+  return Math.floor((monday - baseDate) / WEEK_MS)
 })
 
 const maxVirtualWeek = computed(() => {
   const date = new Date(calendarStore.maxYear, 11, 31)
-  const firstDayOfWeek = new Date(date)
-  const dayOffset = (date.getDay() - calendarStore.config.first_day + 7) % 7
-  firstDayOfWeek.setDate(date.getDate() - dayOffset)
-  return Math.floor((firstDayOfWeek - baseDate) / WEEK_MS)
+  const monday = new Date(date)
+  monday.setDate(date.getDate() - ((date.getDay() + 6) % 7))
+  return Math.floor((monday - baseDate) / WEEK_MS)
 })
 
 const totalVirtualWeeks = computed(() => {
@@ -69,25 +50,18 @@ const initialScrollTop = computed(() => {
 
 const selectedDateRange = computed(() => {
   if (!selection.value.start || !selection.value.end) return ''
-  return formatDateRange(
-    fromLocalString(selection.value.start),
-    fromLocalString(selection.value.end),
-  )
+  return formatDateRange(fromLocalString(selection.value.start), fromLocalString(selection.value.end))
 })
 
 const todayString = computed(() => {
-  const t = calendarStore.now
-    .toLocaleDateString(undefined, { weekday: 'long', month: 'long', day: 'numeric' })
-    .replace(/,? /, '\n')
+  const t = calendarStore.now.toLocaleDateString(undefined, { weekday: 'long', month: 'long', day: 'numeric'}).replace(/,? /, "\n")
   return t.charAt(0).toUpperCase() + t.slice(1)
 })
 
 const visibleWeeks = computed(() => {
   const buffer = 10
   const startIdx = Math.floor((scrollTop.value - buffer * rowHeight.value) / rowHeight.value)
-  const endIdx = Math.ceil(
-    (scrollTop.value + viewportHeight.value + buffer * rowHeight.value) / rowHeight.value,
-  )
+  const endIdx = Math.ceil((scrollTop.value + viewportHeight.value + buffer * rowHeight.value) / rowHeight.value)
 
   const startVW = Math.max(minVirtualWeek.value, startIdx + minVirtualWeek.value)
   const endVW = Math.min(maxVirtualWeek.value, endIdx + minVirtualWeek.value)
@@ -103,6 +77,7 @@ const contentHeight = computed(() => {
   return totalVirtualWeeks.value * rowHeight.value
 })
 
+// Functions moved from store
 function computeRowHeight() {
   const el = document.createElement('div')
   el.style.position = 'absolute'
@@ -116,23 +91,22 @@ function computeRowHeight() {
 }
 
 function getWeekIndex(date) {
-  const firstDayOfWeek = new Date(date)
-  const dayOffset = (date.getDay() - calendarStore.config.first_day + 7) % 7
-  firstDayOfWeek.setDate(date.getDate() - dayOffset)
-  return Math.floor((firstDayOfWeek - baseDate) / WEEK_MS)
+  const monday = new Date(date)
+  monday.setDate(date.getDate() - mondayIndex(date))
+  return Math.floor((monday - baseDate) / WEEK_MS)
 }
 
-function getFirstDayForVirtualWeek(virtualWeek) {
-  const firstDay = new Date(baseDate)
-  firstDay.setDate(firstDay.getDate() + virtualWeek * 7)
-  return firstDay
+function getMondayForVirtualWeek(virtualWeek) {
+  const monday = new Date(baseDate)
+  monday.setDate(monday.getDate() + virtualWeek * 7)
+  return monday
 }
 
 function createWeek(virtualWeek) {
-  const firstDay = getFirstDayForVirtualWeek(virtualWeek)
-  const weekNumber = isoWeekInfo(firstDay).week
+  const monday = getMondayForVirtualWeek(virtualWeek)
+  const weekNumber = isoWeekInfo(monday).week
   const days = []
-  const cur = new Date(firstDay)
+  const cur = new Date(monday)
   let hasFirst = false
   let monthToLabel = null
   let labelYear = null
@@ -167,12 +141,8 @@ function createWeek(virtualWeek) {
       isWeekend: calendarStore.weekend[dow],
       isFirstDay: isFirst,
       lunarPhase: lunarPhaseSymbol(cur),
-      isSelected:
-        selection.value.startDate &&
-        selection.value.dayCount > 0 &&
-        dateStr >= selection.value.startDate &&
-        dateStr <= addDaysStr(selection.value.startDate, selection.value.dayCount - 1),
-      events: eventsForDay,
+      isSelected: selection.value.start && selection.value.end && dateStr >= selection.value.start && dateStr <= selection.value.end,
+      events: eventsForDay
     })
     cur.setDate(cur.getDate() + 1)
   }
@@ -180,9 +150,10 @@ function createWeek(virtualWeek) {
   let monthLabel = null
   if (hasFirst && monthToLabel !== null) {
     if (labelYear && labelYear <= calendarStore.config.max_year) {
+      // Calculate how many weeks this month spans
       let weeksSpan = 0
       const d = new Date(cur)
-      d.setDate(cur.getDate() - 1)
+      d.setDate(cur.getDate() - 1) // Go back to last day of the week we just processed
       
       for (let i = 0; i < 6; i++) {
         d.setDate(cur.getDate() - 1 + i * 7)
@@ -197,7 +168,7 @@ function createWeek(virtualWeek) {
         text: `${getLocalizedMonthName(monthToLabel)} '${year}`,
         month: monthToLabel,
         weeksSpan: weeksSpan,
-        height: weeksSpan * rowHeight.value,
+        height: weeksSpan * rowHeight.value
       }
     }
   }
@@ -207,7 +178,7 @@ function createWeek(virtualWeek) {
     weekNumber: pad(weekNumber),
     days,
     monthLabel,
-    top: (virtualWeek - minVirtualWeek.value) * rowHeight.value,
+    top: (virtualWeek - minVirtualWeek.value) * rowHeight.value
   }
 }
 
@@ -222,47 +193,39 @@ function goToToday() {
 }
 
 function clearSelection() {
-  selection.value = { startDate: null, dayCount: 0 }
+  selection.value = { start: null, end: null }
 }
 
 function startDrag(dateStr) {
   if (calendarStore.config.select_days === 0) return
   isDragging.value = true
   dragAnchor.value = dateStr
-  selection.value = { startDate: dateStr, dayCount: 1 }
+  selection.value = { start: dateStr, end: dateStr }
 }
 
 function updateDrag(dateStr) {
   if (!isDragging.value) return
-  const { startDate, dayCount } = calculateSelection(dragAnchor.value, dateStr)
-  selection.value = { startDate, dayCount }
+  const [start, end] = clampRange(dragAnchor.value, dateStr)
+  selection.value = { start, end }
 }
 
 function endDrag(dateStr) {
   if (!isDragging.value) return
   isDragging.value = false
-  const { startDate, dayCount } = calculateSelection(dragAnchor.value, dateStr)
-  selection.value = { startDate, dayCount }
+  const [start, end] = clampRange(dragAnchor.value, dateStr)
+  selection.value = { start, end }
 }
 
-function calculateSelection(anchorStr, otherStr) {
+function clampRange(anchorStr, otherStr) {
   const limit = calendarStore.config.select_days
-  const anchorDate = fromLocalString(anchorStr)
-  const otherDate = fromLocalString(otherStr)
-  const forward = otherDate >= anchorDate
+  const forward = fromLocalString(otherStr) >= fromLocalString(anchorStr)
   const span = daysInclusive(anchorStr, otherStr)
-
   if (span <= limit) {
-    const startDate = forward ? anchorStr : otherStr
-    return { startDate, dayCount: span }
-  }
-
-  if (forward) {
-    return { startDate: anchorStr, dayCount: limit }
-  } else {
-    const startDate = addDaysStr(anchorStr, -(limit - 1))
-    return { startDate, dayCount: limit }
+    const a = [anchorStr, otherStr].sort()
+    return [a[0], a[1]]
   }
+  if (forward) return [anchorStr, addDaysStr(anchorStr, limit - 1)]
+  return [addDaysStr(anchorStr, -(limit - 1)), anchorStr]
 }
 
 const onScroll = () => {
@@ -278,6 +241,7 @@ const handleJogwheelScrollTo = (newScrollTop) => {
 }
 
 onMounted(() => {
+  // Compute row height and initialize
   computeRowHeight()
   calendarStore.updateCurrentDate()
   
@@ -287,9 +251,10 @@ onMounted(() => {
     viewport.value.addEventListener('scroll', onScroll)
   }
   
+  // Update time periodically
   const timer = setInterval(() => {
     calendarStore.updateCurrentDate()
-  }, 60000)
+  }, 60000) // Update every minute
 
   onBeforeUnmount(() => {
     clearInterval(timer)
@@ -315,14 +280,14 @@ const handleDayMouseEnter = (dateStr) => {
 const handleDayMouseUp = (dateStr) => {
   if (isDragging.value) {
     endDrag(dateStr)
-    const eventData = createEventFromSelection()
-    if (eventData) {
-      clearSelection()
-      emit('create-event', eventData)
+    // Show event dialog if we have a selection
+    if (selection.value.start && selection.value.end && eventDialog.value) {
+      setTimeout(() => eventDialog.value.openCreateDialog(), 50)
     }
   }
 }
 
+// Touch event handlers
 const handleDayTouchStart = (dateStr) => {
   startDrag(dateStr)
 }
@@ -336,16 +301,17 @@ const handleDayTouchMove = (dateStr) => {
 const handleDayTouchEnd = (dateStr) => {
   if (isDragging.value) {
     endDrag(dateStr)
-    const eventData = createEventFromSelection()
-    if (eventData) {
-      clearSelection()
-      emit('create-event', eventData)
+    // Show event dialog if we have a selection
+    if (selection.value.start && selection.value.end && eventDialog.value) {
+      setTimeout(() => eventDialog.value.openCreateDialog(), 50)
     }
   }
 }
 
 const handleEventClick = (eventInstanceId) => {
-  emit('edit-event', eventInstanceId)
+  if (eventDialog.value) {
+    eventDialog.value.openEditDialog(eventInstanceId)
+  }
 }
 </script>
 
@@ -386,7 +352,7 @@ const handleEventClick = (eventInstanceId) => {
             class="month-name-label"
             :style="{ 
               top: week.top + 'px',
-              height: week.monthLabel?.height + 'px',
+              height: week.monthLabel?.height + 'px'
             }"
           >
             <span>{{ week.monthLabel?.text }}</span>
@@ -402,6 +368,11 @@ const handleEventClick = (eventInstanceId) => {
         @scroll-to="handleJogwheelScrollTo" 
       />
     </div>
+    <EventDialog 
+      ref="eventDialog" 
+      :selection="selection" 
+      @clear-selection="clearSelection"
+    />
   </div>
 </template>
 

src/components/EventDialog.vue

@@ -3,10 +3,9 @@ import { useCalendarStore } from '@/stores/CalendarStore'
 import { ref, computed, watch, onMounted, onUnmounted, nextTick } from 'vue'
 import WeekdaySelector from './WeekdaySelector.vue'
 import Numeric from './Numeric.vue'
-import { addDaysStr } from '@/utils/date'
 
 const props = defineProps({
-  selection: { type: Object, default: () => ({ startDate: null, dayCount: 0 }) },
+  selection: { type: Object, default: () => ({ start: null, end: null }) },
 })
 
 const emit = defineEmits(['clear-selection'])
@@ -28,10 +27,9 @@ const eventSaved = ref(false)
 const titleInput = ref(null)
 
 // Helper to get starting weekday (Sunday-first index)
-function getStartingWeekday(selectionData = null) {
-  const currentSelection = selectionData || props.selection
-  if (!currentSelection.start) return 0 // Default to Sunday
-  const date = new Date(currentSelection.start + 'T00:00:00')
+function getStartingWeekday() {
+  if (!props.selection.start) return 0 // Default to Sunday
+  const date = new Date(props.selection.start + 'T00:00:00')
   const dayOfWeek = date.getDay() // 0=Sunday, 1=Monday, ...
   return dayOfWeek // Keep Sunday-first (0=Sunday, 6=Saturday)
 }
@@ -93,23 +91,7 @@ const selectedColor = computed({
   },
 })
 
-function openCreateDialog(selectionData = null) {
-  const currentSelection = selectionData || props.selection
-
-  // Convert new format to start/end for compatibility with existing logic
-  let start, end
-  if (currentSelection.startDate && currentSelection.dayCount) {
-    start = currentSelection.startDate
-    end = addDaysStr(currentSelection.startDate, currentSelection.dayCount - 1)
-  } else if (currentSelection.start && currentSelection.end) {
-    // Fallback for old format
-    start = currentSelection.start
-    end = currentSelection.end
-  } else {
-    start = null
-    end = null
-  }
-
+function openCreateDialog() {
   occurrenceContext.value = null
   dialogMode.value = 'create'
   title.value = ''
@@ -118,16 +100,18 @@ function openCreateDialog(selectionData = null) {
   recurrenceFrequency.value = 'weeks'
   recurrenceWeekdays.value = [false, false, false, false, false, false, false]
   recurrenceOccurrences.value = 0
-  colorId.value = calendarStore.selectEventColorId(start, end)
+  colorId.value = calendarStore.selectEventColorId(props.selection.start, props.selection.end)
   eventSaved.value = false
 
-  const startingDay = getStartingWeekday({ start, end })
+  // Auto-select starting day for weekly recurrence
+  const startingDay = getStartingWeekday()
   recurrenceWeekdays.value[startingDay] = true
 
+  // Create the event immediately in the store
   editingEventId.value = calendarStore.createEvent({
     title: '',
-    startDate: start,
-    endDate: end,
+    startDate: props.selection.start,
+    endDate: props.selection.end,
     colorId: colorId.value,
     repeat: repeat.value,
     repeatInterval: recurrenceInterval.value,

src/components/WeekdaySelector.vue

@@ -34,12 +34,7 @@
 
 <script setup>
 import { computed, ref } from 'vue'
-import {
-  getLocalizedWeekdayNames,
-  getLocaleFirstDay,
-  getLocaleWeekendDays,
-  reorderByFirstDay,
-} from '@/utils/date'
+import { getLocalizedWeekdayNames } from '@/utils/date'
 
 const model = defineModel({
   type: Array,
@@ -61,19 +56,21 @@ if (!model.value) model.value = [...props.fallback]
 const labelsMondayFirst = getLocalizedWeekdayNames()
 const labels = [labelsMondayFirst[6], ...labelsMondayFirst.slice(0, 6)]
 const anySelected = computed(() => model.value.some(Boolean))
-const localeFirst = getLocaleFirstDay()
-const localeWeekend = getLocaleWeekendDays()
+const localeFirst = new Intl.Locale(navigator.language).weekInfo.firstDay % 7
+const localeWeekend = new Intl.Locale(navigator.language).weekInfo.weekend
 const firstDay = computed(() => (props.firstDay ?? localeFirst) % 7)
 
 const weekendDays = computed(() => {
   if (props.weekend && props.weekend.length === 7) return props.weekend
-  return localeWeekend
+  const dayidx = new Set(localeWeekend)
+  return Array.from({ length: 7 }, (_, i) => dayidx.has(i || 7))
 })
 
-const displayLabels = computed(() => reorderByFirstDay(labels, firstDay.value))
-const displayValuesCommitted = computed(() => reorderByFirstDay(model.value, firstDay.value))
-const displayWorking = computed(() => reorderByFirstDay(weekendDays.value, firstDay.value))
-const displayDefault = computed(() => reorderByFirstDay(props.fallback, firstDay.value))
+const reorder = (days) => Array.from({ length: 7 }, (_, i) => days[(i + firstDay.value) % 7])
+const displayLabels = computed(() => reorder(labels))
+const displayValuesCommitted = computed(() => reorder(model.value))
+const displayWorking = computed(() => reorder(weekendDays.value))
+const displayDefault = computed(() => reorder(props.fallback))
 
 // Mapping from display index to original model index
 const orderIndices = computed(() => Array.from({ length: 7 }, (_, i) => (i + firstDay.value) % 7))

src/stores/CalendarStore.js

@@ -1,58 +1,19 @@
 import { defineStore } from 'pinia'
-import {
-  toLocalString,
-  fromLocalString,
-  getLocaleFirstDay,
-  getLocaleWeekendDays,
-} from '@/utils/date'
-
-/**
- * Calendar configuration can be overridden via window.calendarConfig:
- * 
- * window.calendarConfig = {
- *   firstDay: 0,           // 0=Sunday, 1=Monday, etc. (default: 1)
- *   firstDay: 'auto',      // Use locale detection
- *   weekendDays: [true, false, false, false, false, false, true], // Custom weekend
- *   weekendDays: 'auto'    // Use locale detection (default)
- * }
- */
+import { toLocalString, fromLocalString } from '@/utils/date'
 
 const MIN_YEAR = 1900
 const MAX_YEAR = 2100
 
-// Helper function to determine first day with config override support
-function getConfiguredFirstDay() {
-  // Check for environment variable or global config
-  const configOverride = window?.calendarConfig?.firstDay
-  if (configOverride !== undefined) {
-    return configOverride === 'auto' ? getLocaleFirstDay() : Number(configOverride)
-  }
-  // Default to Monday (1) instead of locale
-  return 1
-}
-
-// Helper function to determine weekend days with config override support  
-function getConfiguredWeekendDays() {
-  // Check for environment variable or global config
-  const configOverride = window?.calendarConfig?.weekendDays
-  if (configOverride !== undefined) {
-    return configOverride === 'auto' ? getLocaleWeekendDays() : configOverride
-  }
-  // Default to locale-based weekend days
-  return getLocaleWeekendDays()
-}
-
 export const useCalendarStore = defineStore('calendar', {
   state: () => ({
     today: toLocalString(new Date()),
     now: new Date(),
     events: new Map(), // Map of date strings to arrays of events
-    weekend: getConfiguredWeekendDays(),
+    weekend: [true, false, false, false, false, false, true], // Sunday to Saturday
     config: {
       select_days: 1000,
       min_year: MIN_YEAR,
       max_year: MAX_YEAR,
-      first_day: getConfiguredFirstDay(),
     },
   }),
 

src/utils/date.js

@@ -106,42 +106,6 @@ function getLocalizedWeekdayNames() {
   return res
 }
 
-/**
- * Get the locale's first day of the week (0=Sunday, 1=Monday, etc.)
- * @returns {number} First day of the week (0-6)
- */
-function getLocaleFirstDay() {
-  try {
-    return new Intl.Locale(navigator.language).weekInfo.firstDay % 7
-  } catch {
-    return 1 // Default to Monday if locale info not available
-  }
-}
-
-/**
- * Get the locale's weekend days as an array of booleans (Sunday=index 0)
- * @returns {Array<boolean>} Array where true indicates a weekend day
- */
-function getLocaleWeekendDays() {
-  try {
-    const localeWeekend = new Intl.Locale(navigator.language).weekInfo.weekend
-    const dayidx = new Set(localeWeekend)
-    return Array.from({ length: 7 }, (_, i) => dayidx.has(i || 7))
-  } catch {
-    return [true, false, false, false, false, false, true] // Default to Saturday/Sunday weekend
-  }
-}
-
-/**
- * Reorder a 7-element array based on the first day of the week
- * @param {Array} days - Array of 7 elements (Sunday=index 0)
- * @param {number} firstDay - First day of the week (0=Sunday, 1=Monday, etc.)
- * @returns {Array} Reordered array
- */
-function reorderByFirstDay(days, firstDay) {
-  return Array.from({ length: 7 }, (_, i) => days[(i + firstDay) % 7])
-}
-
 /**
  * Get localized month name
  * @param {number} idx - Month index (0-11)
@@ -212,9 +176,6 @@ export {
   daysInclusive,
   addDaysStr,
   getLocalizedWeekdayNames,
-  getLocaleFirstDay,
-  getLocaleWeekendDays,
-  reorderByFirstDay,
   getLocalizedMonthName,
   formatDateRange,
   lunarPhaseSymbol,