How to Find the Last Day of a Month in Any Browser?

Cross-Browser Technique for Determining Last Day of a Month

To reliably calculate the last day of a month across different browsers, you can employ a technique that leverages the Date object method setFullYear() with a day value of 0.

The following example demonstrates this approach:

<code class="js">var d = new Date();
d.setFullYear(2008, 11, 0);
console.log(d.toString()); // Sun Nov 30 2008</code>

This method exploits the behavior where setting the day value to 0 in setFullYear() leads to the last day of the previous month being returned.

Alternatively, you can use a similar approach with the setDate() method:

<code class="js">var month = 0; // January
var d = new Date(2008, month + 1, 0);
console.log(d.toString()); // last day in January</code>

Both methods provide cross-browser reliability for determining the last day of a month, eliminating any inconsistencies between different browsing environments.

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