design-comuni-plone-theme/src/helpers/dates.js

Volto Theme for Italia design guidelines

import moment from 'moment';
export const viewDate = (locale, value, format) => {
  //  Used to set a server timezone or UTC as default
  moment.updateLocale(locale, moment.localeData(locale)._config); // copy locale to moment-timezone
  let datetime = null;

  if (value) {
    if (typeof value == 'string') {
      // check if datetime has timezone, otherwise assumes it's UTC
      datetime = value.match(/T(.)*(-|\+|Z)/g)
        ? // Since we assume UTC everywhere, then transform to local (momentjs default)
          moment(value)
        : value.match(/T(.)/g)
        ? moment(`${value}Z`) // This might happen in old Plone versions dates
        : moment(value); //This when date is like '2021-05-05'
    } else {
      datetime = moment(value);
    }
  }

  if (format && datetime) {
    return datetime.format(format);
  }
  return datetime;
};

export const getRealStartAndEndWithRecurrence = (
  locale,
  value,
  recurrence,
  rrulestr,
  intl,
) => {
  if (!rrulestr || !recurrence) return null;
  const rruleSet = rrulestr(recurrence, {
    compatible: true,
    forceset: true,
  });
  const recurrenceresults = rruleSet.all();
  return {
    recurrenceStart: viewDate(intl.locale, recurrenceresults?.[0]),
    recurrenceEnd: viewDate(
      intl.locale,
      recurrenceresults?.[recurrenceresults?.length - 1],
    ),
  };
};

export const getRealEventEnd = (content, rruleSet) => {
  let actualEndDate = content.end;

  if (content.recurrence && rruleSet.rrules()[0].options.until) {
    actualEndDate = rruleSet.rrules()[0].options.until;
  }
  return actualEndDate;
};

export const getRecurrenceExceptionDates = (rruleSet) => {
  const rdates = rruleSet?.rdates() ?? [];
  const exdates = rruleSet?.exdates() ?? [];

  const additionalDates = rdates.reduce((acc, curr) => {
    const isExdate = exdates.some((b) => b.toString() === curr.toString());
    if (!isExdate) {
      return [...acc, curr];
    } else return acc;
  }, []);

  const exceptionDates = {
    additionalDates: additionalDates,
    removedDates: exdates,
  };

  return exceptionDates;
};