diff --git a/web/src/components/ui/Calendar.vue b/web/src/components/ui/Calendar.vue
new file mode 100644
index 0000000..bdf2d60
--- /dev/null
+++ b/web/src/components/ui/Calendar.vue
@@ -0,0 +1,158 @@
+<template>
+  <div class="p-3 select-none">
+    <!-- Month header -->
+    <div class="mb-3 flex items-center justify-between">
+      <button
+        type="button"
+        class="flex h-8 w-8 items-center justify-center rounded-md hover:bg-accent focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none"
+        @click="prevMonth"
+        aria-label="Previous month"
+      >
+        <ChevronLeft class="h-4 w-4" />
+      </button>
+      <span class="text-sm font-medium">{{ monthLabel }}</span>
+      <button
+        type="button"
+        class="flex h-8 w-8 items-center justify-center rounded-md hover:bg-accent focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none"
+        @click="nextMonth"
+        aria-label="Next month"
+      >
+        <ChevronRight class="h-4 w-4" />
+      </button>
+    </div>
+
+    <!-- Day-of-week header -->
+    <div class="mb-1 grid grid-cols-7 gap-1">
+      <div
+        v-for="d in dayNames"
+        :key="d"
+        class="flex h-8 items-center justify-center text-[11px] font-medium uppercase tracking-wide text-muted-foreground"
+      >{{ d }}</div>
+    </div>
+
+    <!-- Day grid -->
+    <div class="grid grid-cols-7 gap-1">
+      <div v-for="i in leadingBlanks" :key="'blank-' + i" />
+      <button
+        v-for="day in daysInMonth"
+        :key="day.toISOString()"
+        type="button"
+        :class="cn(
+          'flex h-9 w-9 items-center justify-center rounded-md text-sm transition-colors',
+          'focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none',
+          isOutOfMonth(day) && 'text-muted-foreground/40',
+          isToday(day) && !isSelected(day) && 'ring-1 ring-primary',
+          isRangeStart(day) && 'rounded-l-md bg-primary text-primary-foreground',
+          isRangeEnd(day) && 'rounded-r-md bg-primary text-primary-foreground',
+          isInRange(day) && !isRangeStart(day) && !isRangeEnd(day) && 'bg-primary/15 rounded-none',
+          isPreviewInRange(day) && !isInRange(day) && !isSelected(day) && 'bg-primary/10',
+          !isSelected(day) && !isInRange(day) && !isPreviewInRange(day) && 'hover:bg-accent'
+        )"
+        @click="selectDay(day)"
+        @mouseenter="hoverDay = day"
+        @mouseleave="hoverDay = null"
+        :aria-label="format(day, 'EEEE, MMMM d, yyyy')"
+        :aria-pressed="isSelected(day)"
+      >
+        {{ format(day, 'd') }}
+      </button>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed } from 'vue'
+import {
+  startOfMonth, endOfMonth, eachDayOfInterval, addMonths, subMonths,
+  isSameDay, isToday as dateFnsIsToday, isWithinInterval, format,
+  getDay, isBefore
+} from 'date-fns'
+import { ChevronLeft, ChevronRight } from 'lucide-vue-next'
+import { cn } from '@/lib/utils'
+
+interface DateRange { from: Date | null; to: Date | null }
+
+const props = withDefaults(defineProps<{
+  modelValue?: DateRange
+  mode?: 'single' | 'range'
+  initialMonth?: Date
+}>(), {
+  mode: 'range',
+  modelValue: () => ({ from: null, to: null })
+})
+
+const emit = defineEmits<{
+  'update:modelValue': [value: DateRange]
+}>()
+
+const currentMonth = ref(props.initialMonth ?? new Date())
+const hoverDay = ref<Date | null>(null)
+
+const dayNames = ['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su']
+
+const monthLabel = computed(() => format(currentMonth.value, 'MMMM yyyy'))
+
+const daysInMonth = computed(() => {
+  const start = startOfMonth(currentMonth.value)
+  const end = endOfMonth(currentMonth.value)
+  return eachDayOfInterval({ start, end })
+})
+
+// How many blank cells before the first day (Mon=0, Sun=6)
+const leadingBlanks = computed(() => {
+  const day = getDay(startOfMonth(currentMonth.value))
+  return day === 0 ? 6 : day - 1
+})
+
+function prevMonth() { currentMonth.value = subMonths(currentMonth.value, 1) }
+function nextMonth() { currentMonth.value = addMonths(currentMonth.value, 1) }
+
+function isOutOfMonth(day: Date) {
+  return day.getMonth() !== currentMonth.value.getMonth()
+}
+
+function isToday(day: Date) { return dateFnsIsToday(day) }
+
+function isSelected(day: Date) {
+  return isRangeStart(day) || isRangeEnd(day)
+}
+
+function isRangeStart(day: Date) {
+  return props.modelValue?.from ? isSameDay(day, props.modelValue.from) : false
+}
+
+function isRangeEnd(day: Date) {
+  return props.modelValue?.to ? isSameDay(day, props.modelValue.to) : false
+}
+
+function isInRange(day: Date) {
+  const { from, to } = props.modelValue ?? {}
+  if (!from || !to) return false
+  return isWithinInterval(day, { start: from, end: to }) && !isSameDay(day, from) && !isSameDay(day, to)
+}
+
+function isPreviewInRange(day: Date) {
+  const from = props.modelValue?.from
+  if (!from || props.modelValue?.to || !hoverDay.value) return false
+  const hover = hoverDay.value
+  if (isBefore(hover, from)) return false
+  return isWithinInterval(day, { start: from, end: hover })
+}
+
+function selectDay(day: Date) {
+  if (props.mode === 'single') {
+    emit('update:modelValue', { from: day, to: day })
+    return
+  }
+  const { from, to } = props.modelValue ?? {}
+  if (!from || (from && to)) {
+    emit('update:modelValue', { from: day, to: null })
+  } else {
+    if (isBefore(day, from)) {
+      emit('update:modelValue', { from: day, to: from })
+    } else {
+      emit('update:modelValue', { from, to: day })
+    }
+  }
+}
+</script>
diff --git a/web/src/components/ui/DateRangePicker.vue b/web/src/components/ui/DateRangePicker.vue
new file mode 100644
index 0000000..fd1bd0e
--- /dev/null
+++ b/web/src/components/ui/DateRangePicker.vue
@@ -0,0 +1,158 @@
+<template>
+  <PopoverRoot v-model:open="open">
+    <PopoverTrigger as-child>
+      <Button variant="outline" :class="cn('w-full justify-start gap-2 text-left font-normal', !modelValue?.from && 'text-muted-foreground')">
+        <CalendarIcon class="h-4 w-4 shrink-0" />
+        <span>{{ rangeLabel }}</span>
+      </Button>
+    </PopoverTrigger>
+    <PopoverPortal>
+      <PopoverContent
+        :side-offset="8"
+        class="z-50 w-auto rounded-xl border border-border bg-popover p-0 shadow-xl animate-in fade-in-0 zoom-in-95 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95"
+      >
+        <div class="flex">
+          <!-- Preset sidebar -->
+          <div class="flex w-36 flex-col border-r border-border p-2 gap-1">
+            <button
+              v-for="preset in availablePresets"
+              :key="preset.value"
+              type="button"
+              :class="cn(
+                'rounded-md px-3 py-2 text-left text-sm transition-colors',
+                'hover:bg-accent focus-visible:ring-2 focus-visible:ring-ring focus-visible:outline-none',
+                activePreset === preset.value && 'bg-primary/10 font-medium text-primary'
+              )"
+              @click="applyPreset(preset.value)"
+            >{{ preset.label }}</button>
+          </div>
+
+          <!-- Calendar(s) -->
+          <div class="flex flex-col">
+            <div class="flex">
+              <Calendar
+                v-model="internalRange"
+                :initial-month="calMonth1"
+                mode="range"
+              />
+              <div class="border-l border-border">
+                <Calendar
+                  v-model="internalRange"
+                  :initial-month="calMonth2"
+                  mode="range"
+                />
+              </div>
+            </div>
+
+            <!-- Validation error -->
+            <p v-if="validationError" class="px-4 pb-2 text-xs text-destructive">{{ validationError }}</p>
+
+            <!-- Footer -->
+            <div class="flex items-center justify-end gap-2 border-t border-border px-4 py-3">
+              <Button variant="ghost" size="sm" @click="handleCancel">Cancel</Button>
+              <Button size="sm" :disabled="!canApply" @click="handleApply">Apply</Button>
+            </div>
+          </div>
+        </div>
+      </PopoverContent>
+    </PopoverPortal>
+  </PopoverRoot>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, watch } from 'vue'
+import { format, subDays, startOfMonth } from 'date-fns'
+import { Calendar as CalendarIcon } from 'lucide-vue-next'
+import { PopoverRoot, PopoverTrigger, PopoverPortal, PopoverContent } from 'radix-vue'
+import { cn } from '@/lib/utils'
+import Button from './Button.vue'
+import Calendar from './Calendar.vue'
+
+interface DateRange { from: Date | null; to: Date | null }
+
+const props = withDefaults(defineProps<{
+  modelValue?: DateRange
+}>(), {
+  modelValue: () => ({ from: null, to: null })
+})
+
+const emit = defineEmits<{
+  'update:modelValue': [value: DateRange]
+}>()
+
+const open = ref(false)
+const internalRange = ref<DateRange>({ from: props.modelValue?.from ?? null, to: props.modelValue?.to ?? null })
+
+const today = new Date()
+const calMonth1 = computed(() => startOfMonth(internalRange.value.from ?? today))
+const calMonth2 = computed(() => {
+  const m = new Date(calMonth1.value)
+  m.setMonth(m.getMonth() + 1)
+  return m
+})
+
+const PRESETS = [
+  { value: 'today', label: 'Today' },
+  { value: 'last7', label: 'Last 7 days' },
+  { value: 'last30', label: 'Last 30 days' },
+  { value: 'thisMonth', label: 'This month' },
+  { value: 'custom', label: 'Custom' },
+]
+
+const availablePresets = PRESETS
+
+const activePreset = ref<string>('custom')
+
+function applyPreset(value: string) {
+  activePreset.value = value
+  if (value === 'custom') return
+  const now = new Date()
+  let from: Date
+  let to: Date
+  if (value === 'today') {
+    from = now; to = now
+  } else if (value === 'last7') {
+    from = subDays(now, 6); to = now
+  } else if (value === 'last30') {
+    from = subDays(now, 29); to = now
+  } else if (value === 'thisMonth') {
+    from = startOfMonth(now); to = now
+  } else return
+  internalRange.value = { from, to }
+}
+
+const validationError = computed(() => {
+  if (internalRange.value.from && internalRange.value.to) {
+    if (internalRange.value.from > internalRange.value.to) return 'End date must be after start date'
+  }
+  return null
+})
+
+const canApply = computed(() =>
+  internalRange.value.from !== null &&
+  internalRange.value.to !== null &&
+  !validationError.value
+)
+
+const rangeLabel = computed(() => {
+  const { from, to } = props.modelValue ?? {}
+  if (!from) return 'Pick a date range'
+  if (!to || from.getTime() === to.getTime()) return format(from, 'MMM d, yyyy')
+  return `${format(from, 'MMM d')} – ${format(to, 'MMM d, yyyy')}`
+})
+
+function handleApply() {
+  if (!canApply.value) return
+  emit('update:modelValue', { from: internalRange.value.from, to: internalRange.value.to })
+  open.value = false
+}
+
+function handleCancel() {
+  internalRange.value = { from: props.modelValue?.from ?? null, to: props.modelValue?.to ?? null }
+  open.value = false
+}
+
+watch(() => props.modelValue, (v) => {
+  internalRange.value = { from: v?.from ?? null, to: v?.to ?? null }
+}, { deep: true })
+</script>