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This PHP function creates dropdown select lists for time and date that you can

This PHP function creates dropdown select lists for time and date that you can
change, outputs a 14 char MySQL timestamp in a text field

Enjoy this - I'm sure it could be more elegant, but I couldn't find something like this anywhere 
else. Pull your hair out on more important programming problems! If you like it, or improve 
upon it, drop me a line. 

call the function like this: 
<?PHP 
stamper($previous_value); 
?> 



<?PHP 
function stamper($previous_value) { 

// your constants 
$form_name = "form1"; 
$store_stamp_field = "datestamp"; 

// looks for previous 14 char stamp or defaults to now 
if (!$previous_value) { 
$my_stamp = date("YmdHis"); 
} else { 
$my_stamp = $previous_value; 
} 

// parses the timestamp & digests it into useful variables 
$year=substr($my_stamp,0,4); 
$month=substr($my_stamp,4,2); 
$day=substr($my_stamp,6,2); 
$hour=substr($my_stamp,8,2); 
$minute=substr($my_stamp,10,2); 
$second=substr($my_stamp,12,2); 

// here you can set your ("starting value", "range") for each 
$year_range = array("2000","11"); 
$month_range = array("01","12"); 
$day_range = array("01","31"); 
$hour_range = array("00","24"); 
$minute_range = array("00","60"); 
$second_range = array("00","60"); 
$names = array("month","day","year","hour","minute","second"); 
$names_for_stamp = array("year","month","day","hour","minute","second"); 


// this drops in some javascript to do the onChange event handler for each select list 
echo "<script language=\"JavaScript\">\n"; 
echo "function adj_timestamp () {\n"; 
echo "var each_field = new Array(" . count($names) . ");\n"; 
for ($i=0;$i<count($names);$i++) { 
echo "each_field[" . $i . "] = document." . $form_name . "." . $names_for_stamp[$i] . ".options 
[document." . $form_name . "." . $names_for_stamp[$i] . ".selectedIndex].value;"; 
} 
echo "var timestamp = "; 
for ($i=0;$i<count($names);$i++) { 
if ($i!=(count($names)-1)) { 
echo "each_field[" . $i . "] + "; 
} else { 
echo "each_field[" . $i . "];\n"; 
} 
} 
echo "document." . $form_name . "." . $store_stamp_field . ".value = timestamp;\n"; 
echo "}\n"; 
echo "</script>\n"; 

// this creates the selects and add the JS event handler 
for ($i=0;$i<count($names);$i++) { 
echo "<select name=\"$names[$i]\" onChange=\"adj_timestamp();\">\n"; 
$this_one = ${"$names[$i]" . "_range"}; 
for ($k=0;$k<$this_one[1];$k++) { 
$each_val = $this_one[0]+$k; 
if (strlen($each_val)<2) { 
$each_val = sprintf("%02d", $each_val); 
} 
if (${"$names[$i]"}==$each_val) { 
$selected=" selected"; 
} else { 
$selected=""; 
} 
echo "<option value=\"$each_val\"$selected>$each_val</option>\n"; 
} 
echo "</select>\n"; 
} 

//this creates the initial timestamp 
$the_stamp = $year . $month . $day . $hour . $minute . $second; 

//this holds the dynamic timestamp value, make it hidden once you get the hang of how it all 
works 
echo "<input type=\"text\" name=\"$store_stamp_field\" value=\"$the_stamp\">\n"; 
} 
?>