Generate Add to Google Calendar URL

generateCalendarUrl.ts

// this file is just to set the name of the gist, use just one of the functions below
export * as withLuxon from './withLuxon'
export * as withMoment from './withMoment'
export * as withDateFns from './withDateFns'

withDateFns.ts

import { format, parseISO } from 'date-fns';

export function generateCalendarUrl(
  startDatetime: string,
  endDatetime: string,
  title: string,
  description: string,
  timezone = `America/Sao_Paulo`,
) {
  const dateTimeFormat = `yyyyMMdd'T'HHmmssxxx`;
  const startMoment = parseISO(startDatetime);
  const endMoment = parseISO(endDatetime);

  const calendarInviteUrl = `https://calendar.google.com/calendar/render?action=TEMPLATE&dates=${format(
    startMoment,
    dateTimeFormat,
  )}/${format(endMoment, dateTimeFormat)}${
    timezone && `&ctz=${timezone}`
  }&text=${encodeURI(title)}&details=${encodeURI(description)}`;

  return calendarInviteUrl;
}

withLuxon.ts

import { DateTime } from 'luxon';

export function generateCalendarUrl(startDatetime: string, endDatetime: string, title: string, description: string, timezone = `America/Sao_Paulo`) {
  const dateTimeFormat = `yyyyMMdd'T'HHmmssZZ`;
  const startMoment = DateTime.fromISO(startDatetime).setZone(timezone, { keepLocalTime: true });
  const endMoment = DateTime.fromISO(endDatetime).setZone(timezone, { keepLocalTime: true });

  const calendarInviteUrl = `https://calendar.google.com/calendar/render?action=TEMPLATE&dates=${startMoment.toFormat(
    dateTimeFormat
  )}/${endMoment.toFormat(dateTimeFormat)}${timezone && `&ctz=${timezone}`}&text=${encodeURI(title)}&details=${encodeURI(description)}`;

  return calendarInviteUrl;
}

withMoment.ts

import moment from 'moment-timezone';

type DateType = Date | string | number;

export function generateCalendarUrl(
  startDatetime: DateType,
  endDatetime: DateType,
  title: string,
  description: string,
  timezone = `America/Sao_Paulo`,
) {
  const dateTimeFormat = `YYYYMMDDTHHmmssZ`;
  const startMoment = moment.tz(startDatetime, timezone);
  const endMoment = moment.tz(endDatetime, timezone);

  const calendarInviteUrl = `https://calendar.google.com/calendar/render?action=TEMPLATE&dates=${startMoment.format(
    dateTimeFormat,
  )}/${endMoment.format(dateTimeFormat)}${
    timezone && `&ctz=${timezone}`
  }&text=${encodeURI(title)}&details=${encodeURI(description)}`;

  return calendarInviteUrl;
}