@bimeister/pupakit.calendar/esm2020/declarations/functions/get-weekday-relative-to-new-week-start.function.mjs

PupaKit Calendar

import { DAYS_IN_WEEK } from '../constants/days-in-week.const';
import '../enums/day-of-week.enum';
export function getWeekdayRelativeToNewWeekStart(weekday, oldWeekStart, newWeekStart) {
    const delta = oldWeekStart - newWeekStart;
    const newWeekdayPosition = weekday + delta;
    if (newWeekdayPosition >= DAYS_IN_WEEK) {
        return newWeekdayPosition % DAYS_IN_WEEK;
    }
    if (newWeekdayPosition < 0) {
        return newWeekdayPosition + DAYS_IN_WEEK;
    }
    return newWeekdayPosition;
}
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