Track and manage date ranges inclusive of specific times

http://jsfiddle.net/7vzapm49/1/

var startdatearr = [new Date("04 Dec 2014 14:30:00").toUTCString(), new Date("07 Dec 2014 14:30:00").toUTCString()];
var enddatearr = [new Date("05 Dec 2014 14:30:00").toUTCString(), new Date("08 Dec 2014 14:30:00").toUTCString()];
var d = new Date().toUTCString();

for (i = 0; i < startdatearr.length; i++) {
    if (startdatearr[i] <= d && d <= enddatearr[i]) {
        alert("true");
    } else {
        alert("false");
    }
}

This code snippet previously functioned correctly, but now it seems to be malfunctioning. Even though today's date falls within the specified range of 4th and 5th December 2014 in UTC, it returns false.

Could this issue be related to the month of December, or is the code using outdated methods?

javascriptdate

Answer №1

To successfully compare dates, you need to convert them into milliseconds first instead of comparing strings in a lexical pattern.

var startdatearr = [+new Date("04 Dec 2014 14:30:00"), +new Date("07 Dec 2014 14:30:00")];
var enddatearr = [+new Date("05 Dec 2014 14:30:00"), +new Date("08 Dec 2014 14:30:00")];
var d = +new Date();
for (i = 0; i < startdatearr.length; i++) {
    if (startdatearr[i] <= d && d <= enddatearr[i]) {
        alert("true");
    } else {
        alert("false");
    }
}

If you want to display the converted milliseconds as dates and then in UTC string format, you can use the following code:

alert(new Date(d).toUTCString());
alert(new Date(startdatearr[0]).toUTCString());
alert(new Date(enddatearr[0]).toUTCString());

View Demo

Answer №2

It seems like you are utilizing a ToString flavor method in your code. If this approach worked for you before, it may have been simply by chance. The comparison startdatearr[i] <= d seems to be checking if strings are less than or equal to each other. Any implicit conversions occurring could be specific to the browser/JavaScript implementation and therefore unreliable.

To potentially achieve your goal and meet your UTC requirements, you could try removing the .toUTCString() calls and working directly with the Date object returned. However, keep in mind that this might result in localization based on the browser's timezone (assuming the JavaScript is being executed in a browser environment).

Answer №3

When looking at a UTC date, the initial portion of the string indicates the day of the week. For instance, "04 Dec 2014 14:30:00" in UTC translates to "Thu, 04 Dec 2014 13:30:00 GMT".

Therefore, when comparing d and startdatearr[i], the primary focus is usually on determining which day of the week comes first in alphabetical order.

As a result, the effectiveness of this code can vary depending on the specific day of the week involved.

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