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POVersatile format for date validations?
 

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  1. POVersatile format for date validations?
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    <p>I am looking for a versatile method for validating dates.</p> <p>What I want, is some way of achieving validation rules such as:</p> <p><code>First monday of month</code></p> <p><code>monday or friday</code></p> <p><code>Fourth day of month</code></p> <p>Is there anything that can handle such requirements? Or does anyone have any pointers as to how i could achieve this?</p> <p><strong>Edit: I appreciate the answers, but heres what i ended up using for now:</strong></p> <p>Thanks for all the answers. What i actually ended up using (At least till i find the perfect solution) is roughly this function:</p> <pre><code>function isDateValid($rule,$date){ $DATE = (int) $date; /* Make it safe for eval */ preg_match_all('/:\w:|&amp;&amp;|\|\||&lt;|=|&gt;|!|\(|\)|\d+/i',$rule,$filteredRule); $rule = implode('',$filteredRule[0]); //replace rule notations $f = function($str){ return "date('$str[1]',\$DATE)"; }; //Or if php &lt; 5.3: $f = create_function('$str', 'return "date(\'$str[1]\',\$DATE)";'); $rule = preg_replace_callback('/:(\w):/i', $f, $rule); //Evaluate expression return @eval("return $rule;"); } //Example of usage testing first of month: var_dump( isDateValid(':d:==1',time()) ); </code></pre> <p>This lets me handle all the requirements i have in, well PHP code. The people who use this is very limited (&lt;5 persons) and most of them have some degree of php experience. Now i can make rules such as:</p> <p><code>first monday of month</code> : <code>:w:==1 &amp;&amp; :d: &lt;= 7</code></p> <p><code>monday or friday</code> : <code>:w:==1 || :w:==5</code></p> <p><code>Fourth day of month</code> : <code>:d: == 4</code></p> <p>I would appreciate an even better more flexible solution or feedback regarding security (Can this be injected with mallicious php code?)</p>
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    1. COhttp://php.net/manual/en/function.date.php
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      1. POVersatile format for date validations?
      1. USsskoko
    2. COHave you looked at the [strtotime()](http://php.net/manual/en/function.strtotime.php) function or [DateTime object constructor](http://www.php.net/manual/en/datetime.construct.php)? While `Monday or Friday` is pretty meaningless even to me, both should handle your other two examples
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      1. POVersatile format for date validations?
      1. USMark Baker
    3. COIt is not meaningless say if something is done every monday & friday.. I guess what im looking for is something like a crontab parser.
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