public function updateDateRange($date, $use_year = true)
{
$date = new LsDate($date);
if ($use_year) {
$date->setDay('00');
$date->setMonth('00');
}
if ($date->getYear() == '0000') {
return false;
}
//start date and end date both null, make start date the date
if (!$this->end_date && !$this->start_date) {
$this->start_date = (string) $date;
$this->end_date = (string) $date;
return true;
}
$end_date = new LsDate($this->end_date);
$start_date = new LsDate($this->start_date);
$start_date_comp = LsDate::compare($date, $start_date);
$end_date_comp = LsDate::compare($date, $end_date);
//if date is the same as either start date or end date, make no changes
if ($start_date_comp == LsDate::COMPARE_SAME || $end_date_comp === LsDate::COMPARE_SAME) {
return false;
} else {
if ($start_date_comp == LsDate::COMPARE_BEFORE) {
$this->start_date = (string) $date;
return true;
} else {
if ($end_date_comp == LsDate::COMPARE_AFTER) {
$this->end_date = (string) $date;
return true;
}
}
}
//no changes have been made
return false;
}
static function compare(LsDate $date1, LsDate $date2)
{
//if exactly one of the dates are blank
if ($date1->getYear() == '0000' xor $date2->getYear() == '0000') {
return self::COMPARE_UNKNOWN;
}
if ($date1->_year > $date2->_year) {
return self::COMPARE_AFTER;
} elseif ($date1->_year < $date2->_year) {
return self::COMPARE_BEFORE;
} else {
//years are equal, gotta look closer
if ($date1->_month > $date2->_month && $date2->_month) {
//first month is greater than nonzero second month
return self::COMPARE_AFTER;
} elseif ($date1->_month < $date2->_month && $date1->_month) {
//second month is greater than nonzero first month
return self::COMPARE_BEFORE;
} elseif ($date1->_month == $date2->_month) {
//months are equal, gotta look closer
if ($date1->_day > $date2->_day && $date2->_day) {
//first day is greater than nonzero second day
return self::COMPARE_AFTER;
} elseif ($date1->_day < $date2->_day && $date1->_day) {
//second day is greater than nonzero first day
return self::COMPARE_BEFORE;
} elseif ($date1->_day == $date2->_day) {
//same dates!
return self::COMPARE_SAME;
} else {
//days are unequal but one of them is zero
return self::COMPARE_UNKNOWN;
}
} else {
//months are unequal but one of them is zero
return self::COMPARE_UNKNOWN;
}
}
}
static function birthDatesAreCompatible(LsDate $d1, LsDate $d2, $maxYearDiff = 1)
{
if ($d1->isblank() || $d2->isBlank()) {
return true;
} elseif (abs($d1->getYear() - $d2->getYear()) <= $maxYearDiff && LsLogic::areCompatible($d1->getMonth(true), $d2->getMonth(true)) && LsLogic::areCompatible($d1->getDay(true), $d2->getDay(true))) {
return true;
} else {
return false;
}
}
