@drivy/cobalt/components/Calendar/utils.js

Opinionated design system for Drivy's projects.

import setISODay from 'date-fns/setISODay';
import startOfMonth from 'date-fns/startOfMonth';
import getDay from 'date-fns/getDay';
import endOfMonth from 'date-fns/endOfMonth';
import eachDayOfInterval from 'date-fns/eachDayOfInterval';

const getWeekDays = (isSundayFirstDayOfWeek = false) => {
    const extraIndex = isSundayFirstDayOfWeek ? 0 : 1;
    const now = new Date().setHours(0, 0, 0, 0);
    return [...Array(7).keys()].map((index) => setISODay(now, index + extraIndex));
};
const getMonthDaysByWeeks = (monthDate, isSundayFirstDayOfWeek = false) => {
    const extraOffset = isSundayFirstDayOfWeek ? 0 : 1;
    const firstDayOfMonth = startOfMonth(monthDate);
    const firstDayOfMonthOffset = getDay(firstDayOfMonth) - extraOffset;
    const lastDayOfMonth = endOfMonth(monthDate);
    const days = eachDayOfInterval({
        start: firstDayOfMonth,
        end: lastDayOfMonth,
    });
    return days.reduce((acc, day, index) => {
        if (index === 0 || (index + firstDayOfMonthOffset) % 7 === 0) {
            acc.push([]);
        }
        acc[acc.length - 1].push(day);
        return acc;
    }, []);
};

export { getMonthDaysByWeeks, getWeekDays };
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