Javascript 返回错误的一天

Question

我必须编写函数来确定特定日期是星期几。我写了下面的代码，但它在 99% 的情况下返回错误的一天。你能解释一下为什么吗？

var day = 1, month = 1, year = 2016;

function whatDay(day, month, year) {
    var myDate = new Date();
    myDate.setFullYear(year);
    myDate.setMonth(month);
    myDate.setDate(day);

    console.log( myDate.getDay() );
}

whatDay(day, month, year);

Answer 1

which day of week particular date

看来您正在寻找星期日、星期一等工作日。+

如果是这样，那么下面的代码片段可能会有用

var day = 1, month = 1, year = 2016;

function whatDay(day, month, year) {
    var myDate = new Date();
    myDate.setFullYear(year);
    myDate.setMonth(month);
    myDate.setDate(day);

   var weekday = new Array(7);
    weekday[0] = "Sunday";
    weekday[1] = "Monday";
    weekday[2] = "Tuesday";
    weekday[3] = "Wednesday";
    weekday[4] = "Thursday";
    weekday[5] = "Friday";
    weekday[6] = "Saturday";

   var n = weekday[myDate.getDay()]
   console.log(n); //Monday
}

whatDay(day, month, year);

jsfiddle