@burglekitt/gmt/dist/internal/monthGridWeekRow.js

Temporal-based date and time utilities with timezone support and polyfill integration

/**
 * Return the 1-based calendar-grid week row that `dayInMonth` falls on for
 * `firstOfMonth`'s month, given `firstDay` (locale first day of week,
 * 1 = Monday .. 7 = Sunday).
 *
 * Shared by `getWeekOfMonth` (row for the date itself) and
 * `getWeeksInMonth` (row for the month's last day, i.e. the row count).
 * Week 1 is the row containing the 1st of the month, even when that row
 * is a partial week (date-fns's `getWeekOfMonth` convention).
 */
export function monthGridWeekRow(firstOfMonth, firstDay, dayInMonth) {
    const leadingOffset = (firstOfMonth.dayOfWeek - firstDay + 7) % 7;
    return Math.floor((leadingOffset + dayInMonth - 1) / 7) + 1;
}