Is `Date.setFullYear(year, month, 0)` a reliable way to calculate the last day of the month across different browsers?

Cross-Browser Reliability of Last Day of Month Calculation

Question:

Can we rely on the behavior of Date.setFullYear(year, month, 0) to consistently return the last day of the previous month across different browsers?

Answer:

Yes, this behavior is reliable across major browsers.

Explanation:

The Date object in JavaScript has several methods for setting the year, month, and day of a date. When setting the day to 0, it calculates the last day of the current or previous month. This behavior is consistent in:

• Chrome
• Firefox
• Safari
• Edge

Alternative Method:

The following code snippet demonstrates an alternative method to calculate the last day of a month:

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

This method sets the month to the next month (February) and then sets the day to 0, which effectively gives us the last day of the previous month (January) in this example.

Conclusion:

Both methods for calculating the last day of a month are reliable across major browsers. The Date.setFullYear(year, month, 0) method is more straightforward, while the alternative method may be useful in specific scenarios.

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