Anomaly in Date String Comparison within Angular Controller

Having a puzzling issue when attempting to compare two date strings within my Angular Controller. It seems that the comparison is yielding unexpected results. To explain, I first convert today's date to a string ("2/5/2016") and then proceed to use it as a reference point for comparing with other inputted string dates. Below is the snippet of code in question:

   function deleteTableRows(table) {
        var year = getToday.getFullYear();
        var month = getToday.getMonth() + 1;
        var day = getToday.getDate();
        var currentDate = month + "/" + day + "/" + year;
        var qtr4 = '12/31/' + year;
        var qtr3 = '9/30/' + year;
        for (var i = table.length - 1; i >= 0; i--) {
            if (currentDate < qtr4) {
                if (table[i].intYear == year && table[i].intQuarter == 4) {
                    table.splice(i, 1);
                }
            }
            if (currentDate < qtr3) {
                if (table[i].intYear == year && table[i].intQuarter == 3) {
                    table.splice(i, 1);
                }
            }
        }

};

The confusion arises when comparing currentDate ('2/5/2016') against qtr4 ('12/31/2016'). Surprisingly, the if statement evaluates to FALSE, indicating that 2/5/2016 is NOT less than 12/31/2016. However, when comparing currentDate against qtr3 ('9/30/2016'), the second if statement returns TRUE, suggesting that 2/5/2016 is indeed less than 9/30/2016. This behavior leaves me puzzled, as I suspect there might be a simple oversight on my end. If you have any insights or suggestions, they would be greatly appreciated!

Answer №1

To properly compare dates, utilize the getTime() method like this: yourDate.getTime(). Make sure to convert your date string into a Date object before performing any comparisons.

var currentDate = new Date(month + "/" + day + "/" + year);
var qtr4 = new Date('12/31/' + year);
var qtr3 = new Date('9/30/' + year);

Then you can compare them as follows:

if( currentDate.getTime() < qtr3.getTime() )

Answer №2

When comparing values, it's important to remember that you're dealing with strings rather than actual dates. The forward slash in the date representation is also considered during comparison.
String comparison involves evaluating each character from left to right. If the initial characters are identical, then subsequent characters are compared. If a following character is lower in value, the entire string is deemed as less. The issue at hand arises from the presence of the '/' symbol which comes after '2' - making the entire string greater.

In the case of comparing 2/5/2016 to 9/30/2016, the comparison functions as expected by analyzing '2' and '9' as the first characters followed by '/'. One possible solution is converting the strings into Date objects before utilizing JavaScript for comparison:

var v1 = new Date('2016-05-02')
var v2 = new Date('2016-12-31')
if ( v1 > v2 ) (...)

Answer №3

perform a comparison after converting the strings into date formats:

function removeRowsByDate(table) {
    var currentDate = new Date();
    var year = currentDate.getFullYear();
    var month = currentDate.getMonth() + 1;
    var day = currentDate.getDate();
    var formattedCurrentDate = month + "/" + day + "/" + year;
    var quarter4End = '12/31/' + year;
    var quarter3End = '9/30/' + year;
    for (var i = table.length - 1; i >= 0; i--) {
        if (new Date(formattedCurrentDate) < new Date(quarter4End)) {
            if (table[i].intYear == year && table[i].intQuarter == 4) {
                table.splice(i, 1);
            }
        }
        if (new Date(formattedCurrentDate) < new Date(quarter3End)) {
            if (table[i].intYear == year && table[i].intQuarter == 3) {
                table.splice(i, 1);
            }
        }
    }
};

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