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();
};