Allow luxon alternatives to handle timezones

[boris-graeff]

Hi, we use date-fns on our project, so we would like to avoid having to load luxon in addition to manage the timezones.
What do you think about the possibility to define a static customRezonedDate method that allows to override the rezonedDate method.

• date-fns-tz example

rrule.customRezonedDate = (date, timezone) => dateFnsTz.default.zonedTimeToUtc(date, timezone)`

• moment-timezone example

rrule.customRezonedDate = (date, timezone) => {
  const formattedDate = moment(date).utc()
  return moment.tz(formattedDate,timezone).toDate()
}

It could even be an opportunity to remove the dependency to luxon since this is the only place where it is used.

[davidgoli]

Hi, thanks for contributing! I think this will soon no longer be necessary: #508

[boris-graeff]

Amazing news ! :)