feat(dm): standard forecast added in rest of migration to come

backend/utils/excelToDate.utils.ts

@@ -0,0 +1,28 @@
+import { getJsDateFromExcel } from "excel-date-to-js";
+
+export const excelDateStuff = (serial: number, time?: any) => {
+	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 localOffset = new Date().getTimezoneOffset() / 60;
+	const hours = Math.floor(time / 100);
+	const minutes = time % 100;
+
+	// Set the time in UTC
+	date.setUTCHours(hours + localOffset);
+	date.setUTCMinutes(minutes);
+	date.setUTCSeconds(0);
+	date.setUTCMilliseconds(0);
+
+	//console.log(date.toISOString(), serial, time);
+	return date.toISOString();
+};