Could this be a mistake on my part or have I stumbled upon a software glitch in JavaScript's date function

In my application, there is a straightforward JavaScript function that includes a "Add Day" link. This link successfully adds 1 day to a date in most cases. However, once the date reaches 11/07/2010, the link mysteriously stops working. It's strange because it only malfunctions on that specific date.

To replicate the issue:

  1. Visit the following page: here
  2. Click on "Today" or manually set the date to today.
  3. Continue clicking "Add Day" until you reach 11/07/2010.
  4. Notice how the "Add Day" button ceases to function from this point onwards!
javascriptdate

Answer №1

It seems the issue lies in your method of adding 24 hours to a date to calculate one day ahead. Daylight Savings Time has caused confusion as adding 24 hours to 00:00 on November 7th actually results in 23:00 (repeated) on November 7th.

Answer №2

Several individuals have identified the issue at hand.

To resolve it, you can utilize the overloaded Date constructor that specifies the year, month, and day:

var aDate = new Date(2010, 10, 07);
var aDatePlusOneDay = new Date(aDate.getFullYear(),
                               aDate.getMonth(),
                               aDate.getDate() + 1, // HERE
                               aDate.getHours(),
                               aDate.getMinutes(),
                               aDate.getSeconds(),
                               aDate.getMilliseconds());

Here is a more versatile approach that allows for incrementing any date by a specified amount of milliseconds while considering daylight saving time adjustments:

Date.addTicks = function(date, ticks) {
  var newDate = new Date(date.getTime() + ticks);
  var tzOffsetDelta = newDate.getTimezoneOffset() - date.getTimezoneOffset();
  return new Date(newDate.getTime() + tzOffsetDelta * 60000);
}

In order to add a day to a Date object, simply add the number of milliseconds in one day:

Date.addTicks(new Date(2010, 10, 7), 86400000); // new Date(2010, 10, 8)

References:

Answer №3

When Daylight Savings Time ends (most places in the US do this on the first Sunday of November), the clock is set back. In your code, milliseconds are being added to the start of the specified day from the input box and then returning the beginning of the resulting day. However, due to DST, simply adding seconds and truncating the date in this manner will not accurately advance the date.

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