feat(dm): migrated all the dm topics

backend/utils/excelToDate.utils.ts

@@ -1,21 +1,23 @@
 import { getJsDateFromExcel } from "excel-date-to-js";
 
-export const excelDateStuff = (serial: number, time?: any) => {
+export const excelDateStuff = (
+	serial: number,
+	defaultTime = 800,
+	time?: number,
+) => {
 	if (typeof serial !== "number" || serial <= 0) {
 		return "invalid Date";
 	}
 
-	// Default time to 8:00 AM if not provided
-	if (!time) {
-		time = 800;
-	}
-
 	// Get base date from Excel serial (this gives you UTC midnight)
-	const date = getJsDateFromExcel(serial);
+	const excelTime = excelSerialToTime(serial);
+	const finalTime = time ?? excelTime ?? defaultTime;
+
+	const date = getJsDateFromExcel(Math.floor(serial));
 
 	const localOffset = new Date().getTimezoneOffset() / 60;
-	const hours = Math.floor(time / 100);
-	const minutes = time % 100;
+	const hours = Math.floor(finalTime / 100);
+	const minutes = finalTime % 100;
 
 	// Set the time in UTC
 	date.setUTCHours(hours + localOffset);
@@ -26,3 +28,17 @@ export const excelDateStuff = (serial: number, time?: any) => {
 	//console.log(date.toISOString(), serial, time);
 	return date.toISOString();
 };
+
+const excelSerialToTime = (serial: number): number | null => {
+	const fraction = serial % 1;
+
+	if (fraction <= 0) {
+		return null;
+	}
+
+	const totalMinutes = Math.round(fraction * 24 * 60);
+	const hours = Math.floor(totalMinutes / 60);
+	const minutes = totalMinutes % 60;
+
+	return hours * 100 + minutes;
+};