Trying to generate slots in future based on availableTimes, slots are nothing but they have start time and end time based on slotSize and startTime

Example data:

availableTimes: 
{
  TUESDAY: [{ dayOfTheWeek: "TUESDAY", start: 8, end: 10 }],
},
daysInFuture: 1,
timeZone: "Australia/Melbourne",
slotSizeInMinutes: 60,
timeStamp: 1640041590364

Based on this availableTime Data and considering current date is

2021-12-21T08:00:00.000+11:00

it should return

[
    {
      ref: "2021-12-21T08:00:00.000+11:00",
      startTime: "2021-12-21T08:00:00.000+11:00",
      endTime: "2021-12-21T09:00:00.000+11:00",
      available: true,
    },
    {
      ref: "2021-12-21T09:00:00.000+11:00",
      startTime: "2021-12-21T09:00:00.000+11:00",
      endTime: "2021-12-21T10:00:00.000+11:00",
      available: true,
    },
  ]

which is working as expected, I just want to decrease the complexity of the function.

function generateTimeSlots(
  availableTimes: {
    [x: string]: MenuAvailability[];
  },
  daysInFuture: number,
  timeZone: string,
  slotSizeInMinutes: number,
  timeStamp: number
): orders.TimeSlot[] {
  const timeSlots = [];

  for (let j = 0; j <= daysInFuture; j++) {
    let currentDate = DateTime.fromMillis(timeStamp)
      .setZone(timeZone)
      .plus({ days: j });

    const currentDay = currentDate.weekdayLong.toUpperCase() as DayOfTheWeek;
    const slotsForTheDay = availableTimes[currentDay] ?? [];

    for (let i = 0; i < slotsForTheDay.length; i++) {
      const startHour = slotsForTheDay[i].start;
      const endHour = slotsForTheDay[i].end;

      const numOfSlots = ((endHour - startHour) * 60) / slotSizeInMinutes;

      const addMinutes = (date: DateTime, minutes: number) => {
        return DateTime.fromISO(date.toISO()).plus({ minutes: minutes });
      };

      currentDate = currentDate.set({
        hour: startHour,
        minute: 0,
        second: 0,
        millisecond: 0,
      });

      for (let i = 0; i < numOfSlots; i++) {
        timeSlots.push({
          ref: currentDate.toISO(),
          startTime: currentDate.toISO(),
          endTime: addMinutes(currentDate, slotSizeInMinutes).toISO(),
          available: true,
        });
        currentDate = addMinutes(currentDate, slotSizeInMinutes);
      }
    }
  }

  return timeSlots;
}