What potential issues could arise when comparing dates in PHP using string comparison?

When comparing dates in PHP using string comparison, potential issues may arise due to differences in date formats or time zones. To ensure accurate date comparisons, it is recommended to convert the dates into Unix timestamps using strtotime() before comparing them. This will standardize the date format and avoid any inconsistencies that may occur with string comparison. 

$date1 = "2022-01-15";
$date2 = "2022-01-20";

$timestamp1 = strtotime($date1);
$timestamp2 = strtotime($date2);

if ($timestamp1 < $timestamp2) {
    echo "Date 1 is before Date 2";
} elseif ($timestamp1 > $timestamp2) {
    echo "Date 1 is after Date 2";
} else {
    echo "Date 1 is the same as Date 2";
}

Keywords

date comparison string comparison strtotime date_format date functions

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