js农历、日历代码

// 农历数据（这里只是简单示例部分数据）
const lunarInfo = [0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
    // 更多数据...
];

// 月份天数对应（简单示例）
const monthDays = [29, 30];

function getLunarDate(year, month, day) {
    let offset = (Date.UTC(year, month - 1, day) - Date.UTC(1900, 0, 31)) / 86400000;
    let lunarYear = 1900;
    let lunarMonth = 1;
    let lunarDay = 1;
    let leap = false;

    while (offset >= getLunarYearDays(lunarYear)) {
        offset -= getLunarYearDays(lunarYear);
        lunarYear++;
    }

    let leapMonth = getLeapMonth(lunarYear);
    for (let i = 1; i <= 12; i++) {
        if (offset >= getLunarMonthDays(lunarYear, i)) {
            offset -= getLunarMonthDays(lunarYear, i);
            if (i == leapMonth) {
                if (offset == 0) {
                    leap = true;
                }
                if (leap) {
                    lunarMonth++;
                    leap = false;
                }
            }
            lunarMonth++;
        } else {
            break;
        }
    }
    lunarDay += offset;
    return { lunarYear, lunarMonth, lunarDay, leap };
}

function getLunarYearDays(year) {
    let sum = 348;
    for (let i = 0x8000; i > 0x8; i >>= 1) {
        sum += (lunarInfo[year - 1900] & i)? 1 : 0;
    }
    return sum + getLeapMonthDays(year);
}

function getLeapMonth(year) {
    return lunarInfo[year - 1900] & 0xf;
}

function getLeapMonthDays(year) {
    if (getLeapMonth(year)) {
        return (lunarInfo[year - 1900] & 0x10000)? 30 : 29;
    } else {
        return 0;
    }
}

function getLunarMonthDays(year, month) {
    if (month > 12 || month < 1) {
        return -1;
    }
    return (lunarInfo[year - 1900] & (0x10000 >> month))? 30 : 29;
}


// 示例用法
let solarDate = new Date();
let lunar = getLunarDate(solarDate.getFullYear(), solarDate.getMonth() + 1, solarDate.getDate());
console.log(`阳历 ${solarDate.getFullYear()}-${solarDate.getMonth() + 1}-${solarDate.getDate()} 对应的农历是 ${lunar.lunarYear}年${lunar.leap? '闰' : ''}${lunar.lunarMonth}月${lunar.lunarDay}日`);