使用JS和moment操作日期/时间 [英] Manipulating Date/time with JS and moment

问题描述

我有2个日期，我需要使用这2个日期创建第3个日期.

I have 2 dates and I need to create a 3rd date using those 2 dates.

if (document.getElementById("endDate"))
endDate = document.getElementById("endDate").value;

if (document.getElementById("presentDate"))
presentDate = document.getElementById("presentDate").value;

如果Present date = "12/5/2018"和End date = "12/25/2018"，则我的New date = "12/26/2018";

由于JavaScript日期月份介于0到11之间，而且日期有点凌乱，所以我没有得到想要的结果.

Since, JavaScript date months range from 0-11 and also the dates are kind of messy, I am not getting the desired results.

我尝试过的事情:

var presentDt = new Date(presentDate);
var endDt = new Date(endDate);

var newDay = endDt.getUTCDate()+1; 
var presentMonth = presentDt.getUTCMonth();
var presentYear = presentDt.getUTCFullYear();
var nextDate= presentMonth + '/' + endDay + '/' + presentYear;

• 问题1:上面的代码有效，但是如果我的endDate在31日，则添加UTCDate+1使其成为32，这将返回无效的日期.

  • Issue 1: This above code works but if my endDate is on the 31st, then adding UTCDate+1 makes it 32, which returns invalid date.

    问题2:如果我执行UTCMonth()，则返回11，但是如果我要添加2个月，则返回13，这也是无效的.问题基本上是我无法根据需要操纵日期.

    Issue 2: If I do UTCMonth(), it returns 11 but if I want to add 2 months then it returns 13 which is also invalid. The issue is basically that I am not able to manipulate the dates as I want.

    我也试过了片刻，但是我遇到了类似的问题，而且我无法轻松地按我希望的方式操作日期.

    I also tried moment, however I am having similar issues and I am not able to manipulate the dates easily as I want them to.

    也尝试过getDate和getMonth，但是它做同样的事情.

    Also tried getDate and getMonth but it does the same thing.

    是否有使用JavaScript处理总日期/时间的更好方法?

    Is there a better way of handling the overall date/time with JavaScript?

    推荐答案

    这就是我所做的:

    首先，我创建了以下函数来查看天数和月数.

    First i created the following functions to look at the number of days and months.

     function formattedDate(date) {
            var day = date.getDate();
            var monthIndex = date.getMonth();
            var year = date.getFullYear();
    
            return (monthIndex + 1) + '/' + day + '/' + year;
        }
        function myNewDate(datestring) {
            var dates = datestring.split("/");
            var year, month, day;
            if (dates.length < 3) {
                dates = datestring.split("-");
                year = dates[0];
                month = dates[1] - 1;
                day = dates[2];
            } else  {
                year = dates[2];
                month = dates[0] - 1;
                day = dates[1];
            }
    
    
            var days = [31, 28, 31, 30, 31, 30 ,31, 31, 30, 31, 30, 31];
            // Overflow day
            if (day > days[month])
                day = days[month];
    
            return new Date(year, month, day);
        }
        function newDate(date1, date2) {
            var days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
            var year = date1.getFullYear();
            var month = date1.getMonth() + 1;
            var day = date2.getDate() + 1;
    
    
            // Check leap year
            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
                days[1] = 29;
    
            // Overflow day
            if (day > days[month])
                day = days[month];
    
            var newdate = new Date(year, month, day);
    
            return newdate;
        }
    

    在这里，我使用上述功能创建了新日期.您还可以通过更新上述内容来添加/减去天/月.

    Here, i used the above function to create my new date. You can also add/subtract days/months as you want by updating the above.

            var mpresent = myNewDate(presentDate);
            var mstart = myNewDate(startDate);
            var myDate =  (formattedDate(newDate(mpresent, mstart)));
    

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