var lunar = {
tg: '甲乙丙丁戊己庚辛壬癸',
dz: '子丑寅卯辰巳午未申酉戌亥',
number: '一二三四五六七八九十',
year: '鼠牛虎兔龙蛇马羊猴鸡狗猪',
month: '正二三四五六七八九十冬腊',
monthadd: [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334],
calendar: [0xA4B, 0x5164B, 0x6A5, 0x6D4, 0x415B5, 0x2B6, 0x957, 0x2092F, 0x497, 0x60C96, 0xD4A, 0xEA5, 0x50DA9, 0x5AD, 0x2B6, 0x3126E, 0x92E, 0x7192D, 0xC95, 0xD4A, 0x61B4A, 0xB55, 0x56A, 0x4155B, 0x25D, 0x92D, 0x2192B, 0xA95, 0x71695, 0x6CA, 0xB55, 0x50AB5, 0x4DA, 0xA5B, 0x30A57, 0x52B, 0x8152A, 0xE95, 0x6AA, 0x615AA, 0xAB5, 0x4B6, 0x414AE, 0xA57, 0x526, 0x31D26, 0xD95, 0x70B55, 0x56A, 0x96D, 0x5095D, 0x4AD, 0xA4D, 0x41A4D, 0xD25, 0x81AA5, 0xB54, 0xB6A, 0x612DA, 0x95B, 0x49B, 0x41497, 0xA4B, 0xA164B, 0x6A5, 0x6D4, 0x615B4, 0xAB6, 0x957, 0x5092F, 0x497, 0x64B, 0x30D4A, 0xEA5, 0x80D65, 0x5AC, 0xAB6, 0x5126D, 0x92E, 0xC96, 0x41A95, 0xD4A, 0xDA5, 0x20B55, 0x56A, 0x7155B, 0x25D, 0x92D, 0x5192B, 0xA95, 0xB4A, 0x416AA, 0xAD5, 0x90AB5, 0x4BA, 0xA5B, 0x60A57, 0x52B, 0xA93, 0x40E95]
}
export default function getLunarDate(date) {
var year, month, day;
if (!date) {
date = new Date(), year = date.getFullYear(), month = date.getMonth(), day = date.getDate();
} else {
date = date.split('-'), year = parseInt(date[0]), month = date[1] - 1, day = parseInt(date[2]);
}
if (year < 1921 || year > 2020) {
return {}
}
var total, m, n, k, bit, lunarYear, lunarMonth, lunarDay;
var isEnd = false;
var tmp = year;
if (tmp < 1900) {
tmp += 1900;
}
total = (tmp - 1921) * 365 + Math.floor((tmp - 1921) / 4) + lunar.monthadd[month] + day - 38;
if (year % 4 == 0 && month > 1) {
total++;
}
for (m = 0;; m++) {
k = (lunar.calendar[m] < 0xfff) ? 11 : 12;
for (n = k; n >= 0; n--) {
bit = (lunar.calendar[m] >> n) & 1;
if (total <= 29 + bit) {
isEnd = true;
break;
}
total = total - 29 - bit;
}
if (isEnd) break;
}
lunarYear = 1921 + m;
lunarMonth = k - n + 1;
lunarDay = total;
if (k == 12) {
if (lunarMonth == Math.floor(lunar.calendar[m] / 0x10000) + 1) {
lunarMonth = 1 - lunarMonth;
}
if (lunarMonth > Math.floor(lunar.calendar[m] / 0x10000) + 1) {
lunarMonth--;
}
}
return {
lunarYear: lunarYear,
lunarMonth: lunarMonth,
lunarDay: lunarDay,
};
}