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src/helpers/datetimeToUTC.js

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+import { DateTime } from 'luxon';
+
+const dtToUTC = (datetime, timezone) => {
+	// Create a date object with the selected timezone
+	const dt = DateTime.fromObject({
+		year: datetime.getFullYear(),
+		month: datetime.getMonth(),
+		day: datetime.getDate(),
+		hour: datetime.getHours(),
+		minute: datetime.getMinutes(),
+		zone: timezone,
+	});
+
+	// Convert and return a UTC Timestamp
+	return dt.toUTC().toISO();
+};
+
+export default dtToUTC;