How to Correctly Add 30 Minutes to H:i Time Format in PHP?

Troubleshooting Addition of 30 Minutes to H:i Time Format in PHP

The issue of adding 30 minutes to a time value formatted as H:i in PHP can be resolved by converting the time to a Unix timestamp before performing the addition. This ensures that the time calculation is done correctly.

As mentioned in the question, the original attempt used the strtotime function with the wrong argument. Here's the corrected approach:

<code class="php">$time = strtotime('10:00');
$startTime = date("H:i", strtotime('-30 minutes', $time));
$endTime = date("H:i", strtotime('+30 minutes', $time));</code>

1. Convert the original time ($time) to a Unix timestamp using strtotime('10:00').
2. Add 30 minutes to the timestamp using strtotime('-30 minutes', $time) to get the start time. Format it as H:i using date("H:i", strtotime(...)).
3. Add 30 minutes to the timestamp using strtotime(' 30 minutes', $time) to get the end time. Format it as H:i using date("H:i", strtotime(...)).

By converting to a timestamp first, the addition of minutes can be performed correctly. This will result in the following output for an input of 10:00:

$startTime = 09:30
$endTime = 11:00

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