basic stracture and auth

in memory db :)

packages/shared/src/utils/index.ts

@@ -0,0 +1,26 @@
+export const formatDate = (date: Date): string => {
+  return new Intl.DateTimeFormat('en-US', {
+    year: 'numeric',
+    month: 'short',
+    day: 'numeric',
+  }).format(date)
+}
+
+export const formatCurrency = (
+  amount: number,
+  currency: string = 'USD'
+): string => {
+  return new Intl.NumberFormat('en-US', {
+    style: 'currency',
+    currency,
+  }).format(amount)
+}
+
+export const calculateDaysBetween = (startDate: Date, endDate: Date): number => {
+  const timeDiff = endDate.getTime() - startDate.getTime()
+  return Math.ceil(timeDiff / (1000 * 3600 * 24))
+}
+
+export const generateId = (): string => {
+  return Math.random().toString(36).substr(2, 9)
+}