Problems with getting all events of selected calendars for today using Calendar Provider

Question

I'm trying to get all events for today from Calendar Provider on the base of selected calendars...

private fun getEventsFromSelectedCalendars(selectedIds: MutableList<Long>) {
    eventsListToday.clear()

    val calendar = Calendar.getInstance()
    calendar.set(2022, Calendar.MAY, 12, 0, 0, 0)
    val startDay = calendar.timeInMillis
    calendar.set(2022, Calendar.MAY, 12, 23, 59, 59)
    val endDay = calendar.timeInMillis

    val uri = CalendarContract.Events.CONTENT_URI
    val selection = "((${CalendarContract.Events.CALENDAR_ID} = ?) AND (${CalendarContract.Events.DTSTART} >= $startDay) AND (${CalendarContract.Events.DTSTART} <= $endDay))"

    for(i in 0 until selectedIds.size) {
        val cal = selectedIds[i].toString()
        val selectionArgs = arrayOf(cal)
        val cur = context.contentResolver.query(
            uri,
            EVENT_PROJECTION,
            selection,
            selectionArgs,
            null
        )

        while (cur?.moveToNext() == true) {
            val eventId = cur.getLong(PROJECTION_ID_INDEX)
            val title = cur.getStringOrNull(PROJECTION_TITLE_INDEX)
            val eventLocation = cur.getStringOrNull(PROJECTION_EVENT_LOCATION_INDEX)
            val dtStart = cur.getLongOrNull(PROJECTION_DTSTART_INDEX)
            val dtEnd = cur.getLongOrNull(PROJECTION_DTEND_INDEX)
            val duration = cur.getStringOrNull(PROJECTION_DURATION_INDEX)
            val allDay = cur.getIntOrNull(PROJECTION_ALL_DAY_INDEX) == 1
            val displayColor = cur.getIntOrNull(PROJECTION_DISPLAY_COLOR_INDEX)

            eventsListToday.add(
                EventItemModel(
                    id = eventId,
                    title = title,
                    eventLocation = eventLocation,
                    dtStart = dtStart,
                    dtEnd = dtEnd,
                    duration = duration,
                    allDay = allDay,
                    displayColor = displayColor
                )
            )
        }
        cur?.close()
    }
    eventsListToday.sortWith (compareBy({ it.dtStart }, { it.allDay }))
}

Finally, I get all the info, except recurring events. I read that for getting recurring events I should use CalendarContract.Instances, but I don't know how to use it correctly in relation to my task, taking into account the selected calendar's ids at the same time.

Also my above code gives allday events with dtStart in accordance with my local time zone (time differs from midnight). I've read allday events begin in UTC time zone. How to correct this in my code?

Could somebody help me, please?