Question

我不得不尝试确定隐藏字段中的日期（格式为mm / dd / yyyy）是否小于今天。如果是，我想让这个人知道订阅已经过期。我曾经在某些情况下使用它，但它不能可靠地进行吗？

//this is the expiration date that is in a hidden field
var expireDate = $("#expire").val();

//here I am trying to setup a new date for today and change the output to match the date
//format for the hidden field, i.e. mm/dd/yyyy
var a = new Date();
var b = a.toISOString().split("T")[0].split("-");
var ca = b[1] + "/" + b[2] + "/" + b[0];


//now I want to compare the 2 and if the expiration date is less than today, display a warning message                      
if (expireDate < ca) {
   $("<div class=\"message-warning\">This subscription is expired</div>")
    .insertAfter("#enddate");
};

Answer 1

您正在比较字符串的数值，这恰好是以mm / dd / yyyy格式表示日期的字符串表示形式。我猜你的“不一致”结果是，如果旧日期比今天早，那么它可以工作。

不是将a转换为字符串，而是将expireDate转换为Date对象。然后比较。

var expireDateStr = $("#expire").val();
var expireDateArr = expireDateStr.split("/");
var expireDate = new Date(expireDateArr[2], expireDateArr[0], expireDateArr[1]);
var todayDate = new Date();

if (todayDate > expireDate) {
   $("<div class=\"message-warning\">This subscription is expired</div>")
    .insertAfter("#enddate");
};

Answer 2

var expireDate = $("#expire").val().split('/'),
    expireYear = parseInt(expireDate[2], 10), // cast Strings as Numbers
    expireMo = parseInt(expireDate[0], 10),
    expireDay = parseInt(expireDate[1], 10);

var now = new Date(),
    nowYear = now.getFullYear(),
    nowMo = now.getMonth() + 1, // for getMonth(), January is 0
    nowDay = now.getDate();

// don't expire until day after expiry date
if (nowYear > expireYear ||
    nowYear == expireYear && nowMo > expireMo ||
    nowYear == expireYear && nowMo == expireMo && nowDay > expireDay) {

   $("<div class=\"message-warning\">This subscription is expired</div>")
    .insertAfter("#enddate");

};

Answer 3

other thread

更简单的IMO：

var startDt=document.getElementById("startDateId").value;
var endDt=document.getElementById("endDateId").value;

if( (new Date(startDt).getTime() > new Date(endDt).getTime()))
{
   ----------------------------------
}

日期现在大于给定的日期值

3 个答案: