/**
* Returns date of day after given date
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
function nextDay($day = 0, $month = 0, $year = null, $format = DATE_CALC_FORMAT)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
return Date_Calc::addDays(1, $day, $month, $year, $format);
}
/**
* Subtracts a time span from the date
*
* N.B. it is impossible for this function to count leap seconds,
* because the result would be dependent on which order the consituent
* parts of the span are subtracted from the date. Therefore, leap
* seconds are ignored by this function. If you want to count leap
* seconds, use 'subtractSeconds()'.
*
* @param object $span the time span to subtract
*
* @return void
* @access public
*/
function subtractSpan($span)
{
if (!is_a($span, 'Date_Span')) {
return PEAR::raiseError("Invalid argument - not 'Date_Span' object");
} else {
if ($this->ob_invalidtime) {
return $this->_getErrorInvalidTime();
}
}
$hn_days = -$span->day;
$hn_standardhour = $this->on_standardhour - $span->hour;
$hn_standardminute = $this->on_standardminute - $span->minute;
$hn_standardsecond = $this->on_standardsecond - $span->second;
if ($hn_standardsecond < 0) {
--$hn_standardminute;
$hn_standardsecond += 60;
}
if ($hn_standardminute < 0) {
--$hn_standardhour;
$hn_standardminute += 60;
}
if ($hn_standardhour < 0) {
--$hn_days;
$hn_standardhour += 24;
}
list($hn_standardyear, $hn_standardmonth, $hn_standardday) = explode(" ", Date_Calc::addDays($hn_days, $this->on_standardday, $this->on_standardmonth, $this->on_standardyear, "%Y %m %d"));
$this->setStandardTime($hn_standardday, $hn_standardmonth, $hn_standardyear, $hn_standardhour, $hn_standardminute, $hn_standardsecond, $this->on_standardpartsecond);
}