Why Does My PHP Code Convert Milliseconds to the Wrong Date?

Converting Milliseconds to Date in PHP

You have a numerical string representing a date as milliseconds since the Unix epoch. Aiming to convert it to the "d-m-Y" format, you encountered a discrepancy between the expected and actual output. This article explores the cause of the issue and provides a solution.

Problem:

Your code below returns "25-11-2008" instead of the expected "02-12-2008":

<code class="php">$mil = 1227643821310;
$seconds = $mil / 1000;
echo date("d-m-Y", $seconds);</code>

Solution:

Contrary to the assumption, the provided milliseconds value ("1227643821310") does not correspond to "02-12-2008" but to "25-11-2008." This is the correct conversion for the given input.

The timestamp represents the number of milliseconds since 00:00:00 UTC, January 1, 1970. Dividing it by 1000 converts it to seconds, and the date function then formats it into the desired format.

Conclusion:

The issue lies in the incorrect assumption about the milliseconds value. When converting milliseconds to a date, ensure the accuracy of the input and compare the output against the expected value.

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