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Send the function a date in an array like $arr["year"], $arr["month"] and $arr["day"]. This function does not return an error or give you a hint that the date you picked was invalid, it just returns a timestamp that you can use in the date function.

1. $date = "";
2.  
3. if (sizeof($_POST) > 0) {
4. $date = '<h1>'.valiDate($_POST).'</h1>';
5. }
6. function valiDate($arr) {
7. $year = intval(substr($arr["year"], 0, 4));
8. $month = intval(substr($arr["month"], 0, 2));
9. $day = intval(substr($arr["day"], 0, 2));
10. // not in form but needs to be set, this is for clarity.
11. $n_hour = 8;
12. $n_minute = 0;
13. $n_second = 0;
14. $timestamp = mktime($n_hour, $n_minute, $n_second, $month, $day, $year);
15. $date = date($arr["dateformat"], $timestamp);
16. return $date;
17. }
18.  

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