如何在JavaScript中比较两个日期[重复]

Question

可能重复：
Compare dates with JavaScript

我有两个日期，开始日期和结束日期。我是这样比较它们的：

var fromDate = $("#fromDate").val();
var throughDate = $("#throughDate").val();

if (startdate >= enddate) {
    alert('start date cannot be greater then end date')
}

它给出了正确的结果...唯一的问题是当我比较日期 01/01/2013 和 01/01/2014 时。

如何正确比较 JavaScript 中的日期？

Answer 1

您可以使用它来进行比较：

if (new Date(startDate) > new Date(endDate)) 

使用 new Date(str) 解析值并将其转换为 Date 对象。

Answer 2

您正在比较字符串。您需要先将它们转换为日期。您可以通过拆分字符串并构造 new Date

来实现

new Date(year, month, day [, hour, minute, second, millisecond])

根据你的日期格式，它看起来像

var parts = "01/01/2013".split("/");
var myDate = new Date(parts[2], parts[1] - 1, parts[0]);

Answer 3

        var fromDate = $("#fromDate").val();
      var toDate = $("#throughDate").val();

    //Detailed check for valid date ranges
        //if your date is like 09-09-2012
    var frommonthfield = fromDate.split("-")[1];
    var fromdayfield = fromDate.split("-")[0];
    var fromyearfield = fromDate.split("-")[2];


    var tomonthfield = toDate.split("-")[1];
    var todayfield = toDate.split("-")[0];
    var toyearfield = toDate.split("-")[2];


    var fromDate = new Date(fromyearfield, frommonthfield-1, fromdayfield);
    var toDate = new Date(toyearfield, tomonthfield-1, todayfield);

    if(fromDate.getTime() > today.getTime()){
        alert("from Date should be less than today")
        return;
    }
    if(toDate.getTime() > today.getTime()){
        alert("to Date should be less than today")
        return;
    }
    if(fromDate.getTime() > toDate.getTime()){
        alert("from date should be less than to date")
        return;
    }