How to use the d3-time.utcDay.offset function in d3-time

if (Z && !("Z" in d)) d.Z = 0;

      // The am-pm flag is 0 for AM, and 1 for PM.
      if ("p" in d) d.H = d.H % 12 + d.p * 12;

      // If the month was not specified, inherit from the quarter.
      if (d.m === undefined) d.m = "q" in d ? d.q : 0;

      // Convert day-of-week and week-of-year to day-of-year.
      if ("V" in d) {
        if (d.V < 1 || d.V > 53) return null;
        if (!("w" in d)) d.w = 1;
        if ("Z" in d) {
          week = utcDate(newDate(d.y, 0, 1)), day = week.getUTCDay();
          week = day > 4 || day === 0 ? utcMonday.ceil(week) : utcMonday(week);
          week = utcDay.offset(week, (d.V - 1) * 7);
          d.y = week.getUTCFullYear();
          d.m = week.getUTCMonth();
          d.d = week.getUTCDate() + (d.w + 6) % 7;
        } else {
          week = localDate(newDate(d.y, 0, 1)), day = week.getDay();
          week = day > 4 || day === 0 ? timeMonday.ceil(week) : timeMonday(week);
          week = timeDay.offset(week, (d.V - 1) * 7);
          d.y = week.getFullYear();
          d.m = week.getMonth();
          d.d = week.getDate() + (d.w + 6) % 7;
        }
      } else if ("W" in d || "U" in d) {
        if (!("w" in d)) d.w = "u" in d ? d.u % 7 : "W" in d ? 1 : 0;
        day = "Z" in d ? utcDate(newDate(d.y, 0, 1)).getUTCDay() : localDate(newDate(d.y, 0, 1)).getDay();
        d.m = 0;
        d.d = "W" in d ? (d.w + 6) % 7 + d.W * 7 - (day + 5) % 7 : d.w + d.U * 7 - (day + 6) % 7;

mountData(props = this.props) {
    // find initial date domain (based on initialDatetimeLocation or current time)
    const { extentSize, initialDatetimeLocation, timePrefs } = props;
    const timezone = datetime.getTimezoneFromTimePrefs(timePrefs);
    const mostRecent = datetime.getLocalizedCeiling(new Date().valueOf(), timezone);
    const end = initialDatetimeLocation
      ? datetime.getLocalizedCeiling(initialDatetimeLocation, timezone)
      : mostRecent;
    const start = utcDay.offset(end, -extentSize);
    const dateDomain = [start.toISOString(), end.toISOString()];

    const state = {
      dateDomain: { start: dateDomain[0], end: dateDomain[1] },
      mostRecent: mostRecent.toISOString(),
    };

    this.setState(state, this.determineDataToShow);
    props.onDatetimeLocationChange(dateDomain, end === mostRecent);
  }

goToMostRecent() {
    const { mostRecent: end } = this.state;
    const start = utcDay.offset(new Date(end), -this.props.extentSize).toISOString();
    const newDomain = [start, end];
    this.setExtent(newDomain);
  }

goForward() {
    const oldDomain = _.clone(this.state.dateDomain);
    const { dateDomain: { end: newStart } } = this.state;
    const end = utcDay.offset(new Date(newStart), this.props.extentSize).toISOString();
    const newDomain = [newStart, end];
    this.setExtent(newDomain, [oldDomain.start, oldDomain.end]);
  }

goForward() {
    const oldDomain = _.clone(this.state.dateDomain);
    const { dateDomain: { end: newStart } } = this.state;
    const end = utcDay.offset(new Date(newStart), this.props.extentSize).toISOString();
    const newDomain = [newStart, end];
    this.setExtent(newDomain, [oldDomain.start, oldDomain.end]);
  }

return (dispatch) => {
    const sorted = _.sortBy(
      _.filter(data, (d) => (_.includes(types, d.type))),
      'time'
    );
    const thirtyDaysAgo = utcDay.offset(new Date(), -30).toISOString();
    const indexAtThirtyDaysAgo = _.findLastIndex(sorted, (d) => (d.time < thirtyDaysAgo)) + 1;
    const mostRecentThirtyDaysData = sorted.splice(indexAtThirtyDaysAgo);

    dispatch(workerProcessDataRequest(id, mostRecentThirtyDaysData, timePrefs));
    dispatch(workerProcessDataRequest(id, sorted, timePrefs));
  };
}

goToMostRecent() {
    const { mostRecent: end } = this.state;
    const start = utcDay.offset(new Date(end), -this.props.extentSize).toISOString();
    const newDomain = [start, end];
    this.setExtent(newDomain);
  }