function test_show_calcstepdatetime()
{
$p = new PHPlot_test();
echo "The following are valid steps returned by CalcDatetime():\n";
echo "Seconds Interval\n";
echo "-------- -----------\n";
$prev_step = -1;
for ($i = 1; $i < 2000000; $i++) {
$step = $p->test_CalcStepDatetime($i, 1);
if ($step != $prev_step) {
printf("%8d %s\n", $step, interval($step));
$prev_step = $step;
}
}
echo "\n";
}
