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@ 2019-05-16T09:31:15Z

<?php
// Create key
$key = md5("2019-05-16");

//Validate
for($i=0; $i <= 10; $i++){
    if($key == md5(date("Y-m-d", strtotime("-" . $i . " days")))){
        echo "valid\n";
    }
}



// Create key
$key = md5("2019-05-05");

//Validate
for($i=0; $i <= 10; $i++){
    if($key == md5(date("Y-m-d", strtotime("-" . $i . " days")))){
        echo "valid";
    }
}

Output
Performance
VLD
References
Branches

date: documentation ( source)
strtotime: documentation ( source)
md5: documentation ( source)

preferences:dark modelive previewkey bindings

24.24 ms | 406 KiB | 5 Q