react-day-picker/dist/esm/helpers/getBroadcastWeeksInMonth.js

Customizable Date Picker for React

const FIVE_WEEKS = 5;
const FOUR_WEEKS = 4;
/**
 * Returns the number of weeks to display in the broadcast calendar for a given
 * month.
 *
 * The broadcast calendar may have either 4 or 5 weeks in a month, depending on
 * the start and end dates of the broadcast weeks.
 *
 * @since 9.4.0
 * @param month The month for which to calculate the number of weeks.
 * @param dateLib The date library to use for date manipulation.
 * @returns The number of weeks in the broadcast calendar (4 or 5).
 */
export function getBroadcastWeeksInMonth(month, dateLib) {
    // Get the first day of the month
    const firstDayOfMonth = dateLib.startOfMonth(month);
    // Get the day of the week for the first day of the month (1-7, where 1 is Monday)
    const firstDayOfWeek = firstDayOfMonth.getDay() > 0 ? firstDayOfMonth.getDay() : 7;
    const broadcastStartDate = dateLib.addDays(month, -firstDayOfWeek + 1);
    const lastDateOfLastWeek = dateLib.addDays(broadcastStartDate, FIVE_WEEKS * 7 - 1);
    const numberOfWeeks = dateLib.getMonth(month) === dateLib.getMonth(lastDateOfLastWeek)
        ? FIVE_WEEKS
        : FOUR_WEEKS;
    return numberOfWeeks;
}
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