mktime() should return 86400 (the number of seconds in a
day) for the following calculations.  For some years (1972,
1978, 1989, 1995, 2000, etc.) it returns 90000 instead of
86400.  The following code will demonstrate this.

<?php
function
mktime_test ()
{
  for ($i = 0; $i < 100; ++$i)
    {
      /* $timestamp should = 86400.  (ie: 60 x 60 x 24). */
      $timestamp = mktime (0,0,0,10,30,$i) - mktime
(0,0,0,10,29,$i);

      if ($i < 10)
	{
          $year = "200" . $i;
	}
      else if ($i < 70)
	{
          $year = "20" . $i;
	}
      else
        {
          $year = "19" . $i;
	}

      printf ("
$year - $timestamp<br>
");
    }
}

mktime_test ();
?>