next,prev link problems

i am working on a calendar and i have it set up so that you can cyclye throuhg the months and i want it to change the year as well like if its january of 2007 and you hit prev i want it to become december of 2006.

i have the calendar working completely with the next and prev links working to a point it changes the month ok and i managed to get it to chnage the year when you go from december to january, however for some reason it will not change the year when i go from january to december, even though i used the exact same method to accomplish both.

this is the code i used to accomplish the month switch

PHP Code:

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if(empty($_GET['month'])){
    $today1 = getdate(); 
        $month=$today1['mon'];
}else{$month=$_GET['month'];}
            
if(empty($_GET['year'])){
    $today2 = getdate(); 
    $year=$today2['year'];
}else{$year=$_GET['year'];}
            
if($month==0){
    $month=12;
    $year--;
}
            
if($month==13){
    $month=1;
    $year++;
}
            
fWriteCalendar(fGetEvents(),$month,$year); 


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this is the part of the calendar write function that handles it

PHP Code:

---

function fWriteCalendar($vResults,$vMonth,$vYear){

$today  = getdate();
$temp1 = getdate(mktime(0,0,0,$vMonth,1,$vYear));
$temp2 = getdate(mktime(0,0,0,$vMonth+1,0,$vYear));
$introoffset = $temp1['wday'];
$closeoffset = $temp2['wday'];
$days=$temp2['mday'];
$month=$temp1['month'];
$prevmonth  = $vMonth-1;
$nextmonth  = $vMonth+1;
 $vCalendar= '
<a href="calendar.php?month='.$prevmonth.'&year='.$year.'"><<</a>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Calender of Events for '
.$month.'-'.$vYear.
'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a href="calendar.php?month='.$nextmonth.'&year='.$year.'">>></a>; 


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if anyone can help me figure out why the year will not decrease from january to december it would help alot.

you should let the date() function figure out everything for you instead. unix timestamps are wonderful. it's much more simple, too. example:

PHP Code:

---

<?php
  //get the month. it is held in $_GET['date'] if there is a previous month
  $this_month = (isset($_GET['date']) && is_numeric($_GET['date'])) ? $_GET['date'] : mktime(0, 0, 0, date("n"), 1, date("Y"));
  //next month = this month + 1
  $next_month = mktime(0, 0, 0, date("n", $this_month) + 1, 1, date("Y", $this_month));
  //previous month = this month - 1
  $prev_month = mktime(0, 0, 0, date("n", $this_month) - 1, 1, date("Y", $this_month));
?>
<a href="./calendar.php?date=<?php echo $prev_month; ?>">&lt;&lt; <?php echo date("F, Y", $prev_month); ?></a> - <strong><?php echo date("F, Y", $this_month); ?></strong> - <a href="./calendar.php?date=<?php echo $next_month; ?>">&gt;&gt; <?php echo date("F, Y", $next_month); ?></a>

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see it in action here. you will lose the ability for your users to enter in custom dates via the query string (at least with my version), but you can easily remedy this by not using unix timestamps in the query string and instead only build them for use within the program using mktime().

hope that helps.

Code:

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66.249.72.138 - - [19/Apr/2007:23:36:21 -0600] "GET /php/calendar.php?date=1143874800 HTTP/1.1" 200 162 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.72.138 - - [20/Apr/2007:01:30:35 -0600] "GET /robots.txt HTTP/1.1" 404 1076 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.72.138 - - [20/Apr/2007:01:30:35 -0600] "GET /php/calendar.php?date=1141196400 HTTP/1.1" 200 167 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.72.138 - - [20/Apr/2007:03:20:28 -0600] "GET /php/calendar.php?date=1138777200 HTTP/1.1" 200 169 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.72.105 - - [20/Apr/2007:06:10:01 -0600] "GET /php/calendar.php?date=1201849200 HTTP/1.1" 200 169 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"
66.249.72.105 - - [20/Apr/2007:06:35:01 -0600] "GET /php/calendar.php?date=1136098800 HTTP/1.1" 200 172 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)"

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google was indexing my test thing. and it still is. guess I should be adding a nofollow value to links like that from now on @_@. hehe. fixed!