function adddays($tm, $days)
{
$mdays = array(1 => 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
$time = $tm;
if (isleapyear($time[0])) {
$mdays[2] = 29;
}
if ($days > 0) {
for ($i = 0; $i < $days; $i++) {
if ($time[2] < $mdays[$time[1]]) {
$time[2]++;
} else {
$time[2] = 1;
$time[1]++;
if ($time[1] > 12) {
$time[1] = 1;
$time[0]++;
if (isleapyear($time[0])) {
$mdays[2] = 29;
} else {
$mdays[2] = 28;
}
}
}
}
} else {
for ($i = 0; $i < -$days; $i++) {
if ($time[2] > 1) {
$time[2]--;
} else {
$time[1]--;
if ($time[1] < 1) {
$time[0]--;
if (isleapyear($time[0])) {
$mdays[2] = 29;
} else {
$mdays[2] = 28;
}
$time[1] = 12;
}
$time[2] = $mdays[$time[1]];
}
}
}
return $time;
}
/**
* Get the last month's day number
* @param {number} year
* @param {number} month
* @return {number}
*/
function getLastMonthDayNumber($year, $month)
{
if ($month == 2 && isleapyear($year)) {
return 29;
}
$mdays = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
return $mdays[$month - 1];
}
protected function getDatesByWeek($week, $year)
{
global $locale_info;
$startweekday = 0;
if ($locale_info["LOCALE_IFIRSTDAYOFWEEK"] > 0) {
$startweekday = 7 - $locale_info["LOCALE_IFIRSTDAYOFWEEK"];
}
$L = isleapyear($year) ? 1 : 0;
$months = array(31, 28 + $L, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
$total_days = ($week - 1) * 7;
$i = 0;
$sum = 0;
while ($sum <= $total_days) {
$sum += $months[$i++];
}
$sum -= $months[$i - 1];
$month = $i;
$day = $total_days - $sum;
$day_of_week = getdayofweek(array($year, $month, $day));
if ($day_of_week == 0) {
$day_of_week = 7;
}
$day = $day - ($day_of_week - 1) - $startweekday;
$dates = array();
$dates[0] = getYMDdate(mktime(0, 0, 0, $month, $day, $year));
$dates[1] = getYMDdate(mktime(1, 1, 1, $month, $day + 6, $year));
return $dates;
}