diff --git a/src/components/AppDatePicker.vue b/src/components/AppDatePicker.vue
index b5ad009..b37abe6 100644
--- a/src/components/AppDatePicker.vue
+++ b/src/components/AppDatePicker.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { ref, computed, watch, onBeforeUnmount, nextTick } from 'vue'
 import { Calendar, ChevronLeft, ChevronRight } from 'lucide-vue-next'
+import { getLocaleCode } from '../utils/locale'
 
 interface Props {
   modelValue: string
@@ -29,7 +30,7 @@ const displayText = computed(() => {
   if (!props.modelValue) return null
   const [y, m, d] = props.modelValue.split('-').map(Number)
   const date = new Date(y, m - 1, d)
-  return date.toLocaleDateString('en-US', {
+  return date.toLocaleDateString(getLocaleCode(), {
     month: 'short',
     day: 'numeric',
     year: 'numeric',
@@ -38,7 +39,7 @@ const displayText = computed(() => {
 
 const viewMonthLabel = computed(() => {
   const date = new Date(viewYear.value, viewMonth.value, 1)
-  return date.toLocaleDateString('en-US', { month: 'long', year: 'numeric' })
+  return date.toLocaleDateString(getLocaleCode(), { month: 'long', year: 'numeric' })
 })
 
 // ── Today helpers ───────────────────────────────────────────────────
diff --git a/src/views/Dashboard.vue b/src/views/Dashboard.vue
index 9d623e4..0ac9431 100644
--- a/src/views/Dashboard.vue
+++ b/src/views/Dashboard.vue
@@ -94,6 +94,7 @@ import {
 import { Clock } from 'lucide-vue-next'
 import { useEntriesStore } from '../stores/entries'
 import { useProjectsStore } from '../stores/projects'
+import { formatDateLong } from '../utils/locale'
 import type { TimeEntry } from '../stores/entries'
 
 // Register Chart.js components
@@ -117,12 +118,7 @@ const greeting = computed(() => {
 
 // Formatted date
 const formattedDate = computed(() => {
-  return new Date().toLocaleDateString('en-US', {
-    weekday: 'long',
-    year: 'numeric',
-    month: 'long',
-    day: 'numeric'
-  })
+  return formatDateLong(new Date().toISOString())
 })
 
 // Empty state check
diff --git a/src/views/Entries.vue b/src/views/Entries.vue
index f875637..45c53bc 100644
--- a/src/views/Entries.vue
+++ b/src/views/Entries.vue
@@ -231,6 +231,7 @@ import AppSelect from '../components/AppSelect.vue'
 import AppDatePicker from '../components/AppDatePicker.vue'
 import { useEntriesStore, type TimeEntry } from '../stores/entries'
 import { useProjectsStore } from '../stores/projects'
+import { formatDate } from '../utils/locale'
 
 const entriesStore = useEntriesStore()
 const projectsStore = useProjectsStore()
@@ -316,16 +317,6 @@ function formatDuration(seconds: number): string {
   return `${minutes}m`
 }
 
-// Format date
-function formatDate(dateString: string): string {
-  const date = new Date(dateString)
-  return date.toLocaleDateString('en-US', {
-    month: 'short',
-    day: 'numeric',
-    year: 'numeric'
-  })
-}
-
 // Apply filters
 function applyFilters() {
   entriesStore.fetchEntries(startDate.value || undefined, endDate.value || undefined)
diff --git a/src/views/Invoices.vue b/src/views/Invoices.vue
index ed296bf..5be23a0 100644
--- a/src/views/Invoices.vue
+++ b/src/views/Invoices.vue
@@ -54,7 +54,7 @@
                 {{ formatDate(invoice.date) }}
               </td>
               <td class="px-4 py-3 text-right text-[0.75rem] font-mono text-accent-text">
-                ${{ invoice.total.toFixed(2) }}
+                {{ formatCurrency(invoice.total) }}
               </td>
               <td class="px-4 py-3 text-center">
                 <span
@@ -194,19 +194,19 @@
         <div class="bg-bg-inset rounded-lg p-4">
           <div class="flex justify-between text-[0.75rem] text-text-secondary mb-2">
             <span>Subtotal:</span>
-            <span class="font-mono">${{ calculateSubtotal().toFixed(2) }}</span>
+            <span class="font-mono">{{ formatCurrency(calculateSubtotal()) }}</span>
           </div>
           <div class="flex justify-between text-[0.75rem] text-text-secondary mb-2">
             <span>Tax ({{ createForm.tax_rate }}%):</span>
-            <span class="font-mono">${{ calculateTax().toFixed(2) }}</span>
+            <span class="font-mono">{{ formatCurrency(calculateTax()) }}</span>
           </div>
           <div class="flex justify-between text-[0.75rem] text-text-secondary mb-2">
             <span>Discount:</span>
-            <span class="font-mono">-${{ createForm.discount.toFixed(2) }}</span>
+            <span class="font-mono">-{{ formatCurrency(createForm.discount) }}</span>
           </div>
           <div class="flex justify-between text-text-primary font-medium text-[0.8125rem] pt-2 border-t border-border-subtle">
             <span>Total:</span>
-            <span class="font-mono text-accent-text">${{ calculateTotal().toFixed(2) }}</span>
+            <span class="font-mono text-accent-text">{{ formatCurrency(calculateTotal()) }}</span>
           </div>
         </div>
 
@@ -266,19 +266,19 @@
           <div class="border-t border-border-subtle pt-4">
             <div class="flex justify-between text-[0.75rem] text-text-secondary mb-2">
               <span>Subtotal:</span>
-              <span class="font-mono">${{ (selectedInvoice?.subtotal || 0).toFixed(2) }}</span>
+              <span class="font-mono">{{ formatCurrency(selectedInvoice?.subtotal || 0) }}</span>
             </div>
             <div class="flex justify-between text-[0.75rem] text-text-secondary mb-2">
               <span>Tax ({{ selectedInvoice?.tax_rate || 0 }}%):</span>
-              <span class="font-mono">${{ (selectedInvoice?.tax_amount || 0).toFixed(2) }}</span>
+              <span class="font-mono">{{ formatCurrency(selectedInvoice?.tax_amount || 0) }}</span>
             </div>
             <div class="flex justify-between text-[0.75rem] text-text-secondary mb-2">
               <span>Discount:</span>
-              <span class="font-mono">-${{ (selectedInvoice?.discount || 0).toFixed(2) }}</span>
+              <span class="font-mono">-{{ formatCurrency(selectedInvoice?.discount || 0) }}</span>
             </div>
             <div class="flex justify-between text-text-primary font-medium text-[0.8125rem] pt-2 border-t border-border-subtle">
               <span>Total:</span>
-              <span class="font-mono text-accent-text">${{ (selectedInvoice?.total || 0).toFixed(2) }}</span>
+              <span class="font-mono text-accent-text">{{ formatCurrency(selectedInvoice?.total || 0) }}</span>
             </div>
           </div>
 
@@ -339,6 +339,7 @@ import { useInvoicesStore, type Invoice } from '../stores/invoices'
 import { useClientsStore } from '../stores/clients'
 import { useToastStore } from '../stores/toast'
 import { generateInvoicePdf } from '../utils/invoicePdf'
+import { formatDate, formatCurrency } from '../utils/locale'
 
 const invoicesStore = useInvoicesStore()
 const clientsStore = useClientsStore()
@@ -369,17 +370,6 @@ function getClientName(clientId: number): string {
   return client?.name || 'Unknown Client'
 }
 
-// Format date
-function formatDate(dateString: string): string {
-  if (!dateString) return '-'
-  const date = new Date(dateString)
-  return date.toLocaleDateString('en-US', {
-    month: 'short',
-    day: 'numeric',
-    year: 'numeric'
-  })
-}
-
 // Calculate subtotal (simplified - would need line items in a real app)
 function calculateSubtotal(): number {
   return 0
diff --git a/src/views/Projects.vue b/src/views/Projects.vue
index d802dc0..b7e7024 100644
--- a/src/views/Projects.vue
+++ b/src/views/Projects.vue
@@ -24,7 +24,7 @@
             <div class="flex items-start justify-between">
               <div>
                 <h3 class="text-[0.8125rem] font-semibold text-text-primary">{{ project.name }}</h3>
-                <p class="text-xs text-text-secondary mt-0.5">{{ getClientName(project.client_id) }} · ${{ project.hourly_rate.toFixed(2) }}/hr</p>
+                <p class="text-xs text-text-secondary mt-0.5">{{ getClientName(project.client_id) }} · {{ formatCurrency(project.hourly_rate) }}/hr</p>
               </div>
               <div class="flex items-center gap-1 opacity-0 group-hover:opacity-100 transition-opacity duration-100">
                 <button
@@ -200,6 +200,7 @@ import AppSelect from '../components/AppSelect.vue'
 import { useProjectsStore, type Project } from '../stores/projects'
 import { useClientsStore } from '../stores/clients'
 import { useSettingsStore } from '../stores/settings'
+import { formatCurrency } from '../utils/locale'
 
 const colorPresets = ['#D97706', '#3B82F6', '#8B5CF6', '#EC4899', '#10B981', '#EF4444', '#06B6D4', '#6B7280']
 
diff --git a/src/views/Reports.vue b/src/views/Reports.vue
index cd2e031..5a1d7d8 100644
--- a/src/views/Reports.vue
+++ b/src/views/Reports.vue
@@ -40,7 +40,7 @@
       </div>
       <div>
         <p class="text-[0.6875rem] text-text-tertiary uppercase tracking-[0.08em] mb-1">Earnings</p>
-        <p class="text-[1.25rem] font-[family-name:var(--font-heading)] text-accent-text font-medium">${{ reportData.totalEarnings?.toFixed(2) || '0.00' }}</p>
+        <p class="text-[1.25rem] font-[family-name:var(--font-heading)] text-accent-text font-medium">{{ formatCurrency(reportData.totalEarnings || 0) }}</p>
       </div>
       <div>
         <p class="text-[0.6875rem] text-text-tertiary uppercase tracking-[0.08em] mb-1">Projects</p>
@@ -80,7 +80,7 @@
             </div>
             <div class="flex items-center gap-4">
               <span class="text-[0.75rem] font-mono text-accent-text">{{ formatHours(projectData.total_seconds) }}</span>
-              <span class="text-[0.75rem] font-mono text-text-secondary">${{ ((projectData.total_seconds / 3600) * getProjectRate(projectData.project_id)).toFixed(2) }}</span>
+              <span class="text-[0.75rem] font-mono text-text-secondary">{{ formatCurrency((projectData.total_seconds / 3600) * getProjectRate(projectData.project_id)) }}</span>
             </div>
           </div>
           <div class="w-full bg-bg-elevated rounded-full h-[2px]">
@@ -120,6 +120,7 @@ import {
 } from 'chart.js'
 import { useEntriesStore } from '../stores/entries'
 import { useProjectsStore } from '../stores/projects'
+import { formatCurrency } from '../utils/locale'
 
 // Register Chart.js components
 ChartJS.register(CategoryScale, LinearScale, BarElement, Title, Tooltip, Legend)
diff --git a/src/views/Timer.vue b/src/views/Timer.vue
index e61080c..a9769ab 100644
--- a/src/views/Timer.vue
+++ b/src/views/Timer.vue
@@ -87,7 +87,7 @@
           </div>
           <div class="text-right">
             <p class="text-[0.75rem] font-mono text-text-primary">{{ formatDuration(entry.duration) }}</p>
-            <p class="text-[0.6875rem] text-text-tertiary">{{ formatDate(entry.start_time) }}</p>
+            <p class="text-[0.6875rem] text-text-tertiary">{{ formatDateTime(entry.start_time) }}</p>
           </div>
         </div>
       </div>
@@ -110,6 +110,7 @@ import { useEntriesStore } from '../stores/entries'
 import { useToastStore } from '../stores/toast'
 import { Timer as TimerIcon } from 'lucide-vue-next'
 import AppSelect from '../components/AppSelect.vue'
+import { formatDateTime } from '../utils/locale'
 
 const timerStore = useTimerStore()
 const projectsStore = useProjectsStore()
@@ -200,17 +201,6 @@ function formatDuration(seconds: number): string {
   return `${minutes}m`
 }
 
-// Format date
-function formatDate(dateString: string): string {
-  const date = new Date(dateString)
-  return date.toLocaleDateString('en-US', {
-    month: 'short',
-    day: 'numeric',
-    hour: '2-digit',
-    minute: '2-digit'
-  })
-}
-
 // Load data on mount
 onMounted(async () => {
   await Promise.all([