js根据公历日期求每天的天干地支

function getDayGanZhiByDate(year, month, day) {// 1900 3 1 癸酉var date = new Date();date.setFullYear(1900);date.setMonth(2);date.setDate(1);date.setHours(12);date.setMinutes(0);date.setSeconds(0);date.setMilliseconds(0);var date1 = new Date();date1.setFullYear(year);date1.setMonth(month - 1);date1.setDate(day);date1.setHours(12)date1.setMinutes(0)date1.setSeconds(0)date1.setMilliseconds(0)var days = Math.round((date1.getTime() -