ladybird/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp

/*
 * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibJS/Runtime/Temporal/Calendar.h>
#include <LibJS/Runtime/Temporal/PlainDate.h>
#include <LibJS/Runtime/Value.h>

namespace JS::Temporal {

// 3.5.5 IsValidISODate ( year, month, day ), https://tc39.es/proposal-temporal/#sec-temporal-isvalidisodate
bool is_valid_iso_date(i32 year, i32 month, i32 day)
{
    // 1. Assert: year, month, and day are integers.

    // 2. If month < 1 or month > 12, then
    if (month < 1 || month > 12) {
        // a. Return false.
        return false;
    }

    // 3. Let daysInMonth be ! ISODaysInMonth(year, month).
    auto days_in_month = iso_days_in_month(year, month);

    // 4. If day < 1 or day > daysInMonth, then
    if (day < 1 || day > days_in_month) {
        // a. Return false.
        return false;
    }

    // 5. Return true.
    return true;
}

}