/**
* Test that date can determine if it is in a leap year
*/
public function testIsLeapyear()
{
$date = new qCal_Date(2009, 4, 23);
$this->assertFalse($date->isLeapYear());
$date2 = new qCal_Date(2008, 4, 23);
$this->assertTrue($date2->isLeapYear());
}
/**
* Determine the number or Tuesdays (or whatever day of the week this date is) since the
* beginning or end of the year.
*/
public function getXthWeekdayOfYear($xth, $weekday = null, $year = null)
{
$negpos = substr($xth, 0, 1);
if ($negpos == "+" || $negpos == "-") {
$xth = (int) substr($xth, 1);
} else {
$negpos = "+";
}
if (is_null($weekday)) {
$weekday = $this->getWeekday();
}
if (ctype_digit((string) $weekday)) {
if (!array_key_exists($weekday, $this->weekdays)) {
throw new qCal_Date_Exception_InvalidWeekday("\"{$weekday}\" is not a valid weekday.");
}
} else {
$weekday = strtolower($weekday);
if (!in_array($weekday, $this->weekdays)) {
throw new qCal_Date_Exception_InvalidWeekday("\"{$weekday}\" is not a valid weekday.");
}
$wdays = array_flip($this->weekdays);
$weekday = $wdays[$weekday];
}
if (is_null($year)) {
$year = $this->getYear();
}
if (!ctype_digit((string) $year) || strlen($year) != 4) {
throw new qCal_Date_Exception_InvalidYear("\"{$year}\" is not a valid year.");
}
// now find the specified day by counting either forwards or backwards to the day in question
$firstofyear = new qCal_Date($year, 1, 1);
$numdaysinyear = $firstofyear->isLeapYear() ? 366 : 365;
$numweekdays = 0;
// the number of weekdays that have occurred within the loop
$found = false;
// whether or not the specified day has been found
if ($negpos == "+") {
// count forward
// loop over every day of every month looking for the right one
$day = 1;
$wday = $firstofyear->getWeekDay();
while ($day <= $numdaysinyear) {
// if the specified weekday == the current week day in the loop
if ($weekday == $wday) {
$numweekdays++;
if ($numweekdays == $xth) {
// break out of the loop, we've found the right day! yay!
$found = $day;
break;
}
}
if ($wday == 6) {
$wday = 0;
} else {
$wday++;
}
$day++;
}
} else {
// count backward
$lastofyear = new qCal_Date($year, 12, 31);
// count forward
// loop over every day of every month looking for the right one
$day = $numdaysinyear;
$wday = $lastofyear->getWeekDay();
while ($day >= 1) {
// if the specified weekday == the current week day in the loop
if ($weekday == $wday) {
$numweekdays++;
if ($numweekdays == $xth) {
// break out of the loop, we've found the right day! yay!
$found = $day;
break;
}
}
if ($wday == 0) {
$wday = 6;
} else {
$wday--;
}
$day--;
}
}
// @todo: Can't use checkdate here, so find another validation method...
if ($found) {
$date = new qCal_Date($year, 1, $found, true);
// takes advantage of the rollover feature :)
} else {
throw new qCal_DateTime_Exception_InvalidDate("You have specified an incorrect number of days for qCal_Date::getXthWeekdayOfYear()");
}
return $date;
}
