import { DateTime } from "luxon";
import { DATE_FORMAT, EXAMPLE_VALID_DATE_TIME } from "../constants.js";
import { isValidZone } from "../utils.js";
/**
* Convert a date time string from one timezone to another
* @param {string} dateTime - The date time string to convert
* @param {string} fromZone - The IANA timezone of the date time string
* @param {string} toZone - The IANA timezone to convert the date time string to
* @returns {string} - The converted date time string
*/
export const convertTimezones = (dateTime, fromZone, toZone) => {
const zonedDateTime = DateTime.fromFormat(dateTime, DATE_FORMAT, {
zone: fromZone
});
if (!zonedDateTime.isValid) {
return `Invalid date time string: ${dateTime}. Must follow format: ${EXAMPLE_VALID_DATE_TIME}`
}
if (!isValidZone(toZone)) {
return `Invalid timezone: ${toZone}. Must be a valid IANA timezone. Example: Asia/Kolkata`
}
const convertedDateTime = zonedDateTime.setZone(toZone);
if (!convertedDateTime.isValid) {
return `Invalid date time string: ${convertedDateTime} with timezone ${toZone}. The timezone ${toZone} is not a valid IANA timezone.`
}
const weekday = convertedDateTime.weekdayLong;
return `${convertedDateTime.toFormat(DATE_FORMAT)}, ${weekday} in ${toZone}`;
};
