update db str

src/lib/api.ts

@@ -171,3 +171,16 @@ export async function getEntriesByDate(
     { token }
   )
 }
+// ============================================
+// TIMEZONE CONVERSION ENDPOINTS
+// ============================================
+
+export async function convertUTCToIST(utcTimestamp: string) {
+  return apiCall<{ utc: string; ist: string }>(
+    `/api/entries/convert-timestamp/utc-to-ist`,
+    {
+      method: 'POST',
+      body: { timestamp: utcTimestamp },
+    }
+  )
+}

src/lib/timezone.ts

@@ -0,0 +1,106 @@
+/**
+ * Timezone Utilities
+ * Handles conversion between UTC and IST (Indian Standard Time)
+ */
+
+/**
+ * Convert UTC ISO string to IST
+ * @param utcIsoString - UTC timestamp in ISO format (e.g., "2026-03-04T10:30:45.123Z")
+ * @returns Date object in IST timezone
+ */
+export function utcToIST(utcIsoString: string): Date {
+  return new Date(utcIsoString)
+}
+
+/**
+ * Format a UTC ISO timestamp as IST
+ * @param utcIsoString - UTC timestamp in ISO format
+ * @param format - Format type: 'date', 'time', 'datetime', 'full'
+ * @returns Formatted string in IST
+ */
+export function formatIST(
+  utcIsoString: string,
+  format: 'date' | 'time' | 'datetime' | 'full' = 'datetime'
+): string {
+  const date = new Date(utcIsoString)
+
+  // IST is UTC+5:30
+  const istDate = new Date(date.getTime() + 5.5 * 60 * 60 * 1000)
+
+  switch (format) {
+    case 'date':
+      return istDate.toLocaleDateString('en-IN', {
+        year: 'numeric',
+        month: 'short',
+        day: '2-digit',
+      }).toUpperCase()
+
+    case 'time':
+      return istDate.toLocaleTimeString('en-IN', {
+        hour: '2-digit',
+        minute: '2-digit',
+        hour12: false,
+      }).toUpperCase()
+
+    case 'datetime':
+      return istDate.toLocaleString('en-IN', {
+        year: 'numeric',
+        month: 'short',
+        day: '2-digit',
+        hour: '2-digit',
+        minute: '2-digit',
+        hour12: false,
+      }).toUpperCase()
+
+    case 'full':
+      return istDate.toLocaleString('en-IN', {
+        weekday: 'short',
+        year: 'numeric',
+        month: 'short',
+        day: '2-digit',
+        hour: '2-digit',
+        minute: '2-digit',
+        second: '2-digit',
+        hour12: false,
+      }).toUpperCase()
+
+    default:
+      return istDate.toISOString()
+  }
+}
+
+/**
+ * Get IST date components from UTC ISO string
+ * @param utcIsoString - UTC timestamp in ISO format
+ * @returns Object with date components in IST
+ */
+export function getISTDateComponents(utcIsoString: string) {
+  const date = new Date(utcIsoString)
+  const istDate = new Date(date.getTime() + 5.5 * 60 * 60 * 1000)
+
+  return {
+    year: istDate.getUTCFullYear(),
+    month: istDate.getUTCMonth(),
+    date: istDate.getUTCDate(),
+    day: istDate.getUTCDay(),
+    hours: istDate.getUTCHours(),
+    minutes: istDate.getUTCMinutes(),
+    seconds: istDate.getUTCSeconds(),
+  }
+}
+
+/**
+ * Format date as YYYY-MM-DD (IST)
+ * @param utcIsoString - UTC timestamp in ISO format
+ * @returns Date string in YYYY-MM-DD format (IST)
+ */
+export function formatISTDateOnly(utcIsoString: string): string {
+  const date = new Date(utcIsoString)
+  const istDate = new Date(date.getTime() + 5.5 * 60 * 60 * 1000)
+
+  const year = istDate.getUTCFullYear()
+  const month = String(istDate.getUTCMonth() + 1).padStart(2, '0')
+  const day = String(istDate.getUTCDate()).padStart(2, '0')
+
+  return `${year}-${month}-${day}`
+}