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app/utils/calendar.utill.js

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+/**
+ * Copyright (c) 2026 Niolla
+ * All rights reserved.
+ *
+ * This source code is proprietary and confidential.
+ * Unauthorized copying, modification, distribution, or use
+ * of this file, via any medium, is strictly prohibited.
+ */
+
+// app/utils/calendar.util.js
+
+const db = require("../models");
+const { log } = require("./consoleLog.utill");
+
+const Calendar = db.calender;
+const CalenderHoliday = db.calenderHolidays;
+
+
+const calculateDeadline = async () => {
+    let deadlineDate = new Date();
+
+    const currentYear = deadlineDate.getFullYear();
+
+    // Get calendar for current year
+    const calendar = await Calendar.findOne({
+        where: {
+            year: currentYear
+        }
+    });
+
+    if (!calendar) {
+        throw new Error(`Calendar for year ${currentYear} not found`);
+    }
+
+
+    deadlineDate.setDate(deadlineDate.getDate() + 1);
+
+
+    while (true) {
+
+        const month = deadlineDate.getMonth() + 1;
+        const day = deadlineDate.getDate();
+
+
+        // Get holidays for this month
+        const holidays = await CalenderHoliday.findAll({
+            where: {
+                calender_id: calendar.calender_id,
+                month: month,
+                shouldConsiderAsHoliday: true
+            }
+        });
+
+
+        const isWeekend =
+            deadlineDate.getDay() === 0 ||
+            deadlineDate.getDay() === 6;
+
+
+        const holiday = holidays.find(
+            h => h.day === day
+        );
+
+
+        const isHoliday =
+            isWeekend || !!holiday;
+
+
+        log(
+            `${deadlineDate.toISOString().split("T")[0]} => Holiday: ${isHoliday}`
+        );
+
+
+        if (!isHoliday) {
+            return deadlineDate;
+        }
+
+
+        // Move one more day
+        deadlineDate.setDate(
+            deadlineDate.getDate() + 1
+        );
+    }
+};
+
+module.exports = {
+    calculateDeadline
+};