What potential issues can arise when formatting dates to display week and year in PHP?

When formatting dates to display week and year in PHP, one potential issue that can arise is incorrect week numbering based on different start-of-week settings. To solve this, you can use the ISO-8601 standard for week numbering, which defines the first week of the year as the one that contains the first Thursday. This ensures consistent week numbering across different systems. 

$date = "2022-01-01";
$week = date('W', strtotime($date));
$year = date('Y', strtotime($date));

echo "Week $week of $year";

Keywords

DateTime strftime date week number formatting

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