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backend/src/shared-minimal/utils/formatters.ts

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+/**
+ * @ai-summary Generic formatting utilities (no business logic)
+ * @ai-context Pure functions only, no feature-specific logic
+ */
+
+export function formatDate(date: Date): string {
+  return date.toISOString().split('T')[0];
+}
+
+export function formatDateTime(date: Date): string {
+  return date.toISOString();
+}
+
+export function formatCurrency(amount: number, currency = 'USD'): string {
+  return new Intl.NumberFormat('en-US', {
+    style: 'currency',
+    currency,
+  }).format(amount);
+}
+
+export function formatDistance(meters: number): string {
+  if (meters < 1000) {
+    return `${Math.round(meters)}m`;
+  }
+  return `${(meters / 1000).toFixed(1)}km`;
+}
+
+export function formatMPG(miles: number, gallons: number): string {
+  if (gallons === 0) return '0 MPG';
+  return `${(miles / gallons).toFixed(1)} MPG`;
+}