php 时隔日期工具类

<?phpDateTimeUtils::addDate('2012-12-01',1,'y');DateTimeUtils::getWeekDay('2012/10/01','/');DateTimeUtils::isLeapYear('2012');class DateTimeUtils {	/**	 * Checks for leap year, returns true if it is. No 2-digit year check. Also	 * handles julian calendar correctly.	 * @param integer $year year to check	 * @return boolean true if is leap year	 */	public static function isLeapYear($year)	{		$year = self::digitCheck($year);		if ($year % 4 != 0)			return false;		if ($year % 400 == 0)			return true;		// if gregorian calendar (>1582), century not-divisible by 400 is not leap		else if ($year > 1582 && $year % 100 == 0 )			return false;		return true;	}	/**	 * Fix 2-digit years. Works for any century.	 * Assumes that if 2-digit is more than 30 years in future, then previous century.	 * @param integer $y year	 * @return integer change two digit year into multiple digits	 */	protected static function digitCheck($y)	{		if ($y < 100){			$yr = (integer) date("Y");			$century = (integer) ($yr /100);			if ($yr%100 > 50) {				$c1 = $century + 1;				$c0 = $century;			} else {				$c1 = $century;				$c0 = $century - 1;			}			$c1 *= 100;			// if 2-digit year is less than 30 years in future, set it to this century			// otherwise if more than 30 years in future, then we set 2-digit year to the prev century.			if (($y + $c1) < $yr+30) $y = $y + $c1;			else $y = $y + $c0*100;		}		return $y;	}	/**	 * Returns 4-digit representation of the year.	 * @param integer $y year	 * @return integer 4-digit representation of the year	 */	public static function get4DigitYear($y)	{		return self::digitCheck($y);	}	/**	 * Checks to see if the year, month, day are valid combination.	 * @param integer $y year	 * @param integer $m month	 * @param integer $d day	 * @return boolean true if valid date, semantic check only.	 */	public static function isValidDate($y,$m,$d)	{		return checkdate($m, $d, $y);	}	public static function checkDate($date, $separator = "-") { //检查日期是否合法日期		$dateArr = explode ($separator, $date);		if (is_numeric ( $dateArr [0] ) && is_numeric ( $dateArr [1] ) && is_numeric ( $dateArr [2] )) {			return checkdate ( $dateArr [1], $dateArr [2], $dateArr [0] );		}		return false;	}	/**	 * Checks to see if the hour, minute and second are valid.	 * @param integer $h hour	 * @param integer $m minute	 * @param integer $s second	 * @param boolean $hs24 whether the hours should be 0 through 23 (default) or 1 through 12.	 * @return boolean true if valid date, semantic check only.	 * @since 1.0.5	 */	public static function isValidTime($h,$m,$s,$hs24=true)	{		if($hs24 && ($h < 0 || $h > 23) || !$hs24 && ($h < 1 || $h > 12)) return false;		if($m > 59 || $m < 0) return false;		if($s > 59 || $s < 0) return false;		return true;	}	public static function checkTime($time, $separator = ":") { //检查时间是否合法时间  		$timeArr = explode ($separator, $time );		if (is_numeric ( $timeArr [0] ) && is_numeric ( $timeArr [1] ) && is_numeric ( $timeArr [2] )) {			if (($timeArr [0] >= 0 && $timeArr [0] <= 23) && ($timeArr [1] >= 0 && $timeArr [1] <= 59) && ($timeArr [2] >= 0 && $timeArr [2] <= 59))				return true;			else				return false;		}		return false;	}		public static function addDate($date, $int, $unit = "d") { //日期的增加		$dateArr = explode ( "-", $date );		$value [$unit] = $int;		return date ( "Y-m-d", mktime ( 0, 0, 0, $dateArr [1] + $value ['m'], $dateArr [2] + $value ['d'], $dateArr [0] + $value ['y'] ) );		}		public static function addDayTimestamp($ntime, $aday) { //取当前时间后几天，天数增加单位为1		$dayst = 3600 * 24;		$oktime = $ntime + ($aday * $dayst);		return $oktime;	}		public static function dateDiff($date1, $date2, $unit = "d") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天  		switch ($unit) {			case 's' :				$dividend = 1;				break;			case 'i' :				$dividend = 60;				break;			case 'h' :				$dividend = 3600;				break;			case 'd' :				$dividend = 86400;				break;			default :				$dividend = 86400;		}		$time1 = strtotime ( $date1 );		$time2 = strtotime ( $date2 );		if ($time1 && $time2)			return ( float ) ($time1 - $time2) / $dividend;		return false;	}	//2011-12-06  =>	public static function getWeekDay($date, $separator = "-") { //计算出给出的日期是星期几		$dateArr = explode ($separator, $date);		return date ( "w", mktime ( 0, 0, 0, $dateArr [1], $dateArr [2], $dateArr [0] ) );	}		public static function floorTime($seconds) { //让日期显示为:XX天XX年以前 		$times = '';		$days = floor ( ($seconds / 86400) % 30 );		$hours = floor ( ($seconds / 3600) % 24 );		$minutes = floor ( ($seconds / 60) % 60 );		$seconds = floor ( $seconds % 60 );		if ($seconds >= 1)			$times .= $seconds . '秒';		if ($minutes >= 1)			$times = $minutes . '分钟 ' . $times;		if ($hours >= 1)			$times = $hours . '小时 ' . $times;		if ($days >= 1)			$times = $days . '天';		if ($days > 30)			return false;		$times .= '前';		return str_replace ( " ", '', $times );	}		public static function transDateToChs($date) {		if (empty ( $date ))			return '今日';		$y = date ( 'Y', strtotime ( $date ) );		$m = date ( 'm', strtotime ( $date ) );		$d = date ( 'd', strtotime ( $date ) );		return $y . '年' . $m . '月' . $d . '日';	}		// 08/31/2004 => 2004-08-31	public static function TransDateUI($datestr, $type = 'Y-m-d') {		if ($datestr == Null)			return Null;		$target = $datestr;		$arr_date = preg_split ( "/\//", $target );		$monthstr = $arr_date [0];		$daystr = $arr_date [1];		$yearstr = $arr_date [2];		$result = date ( $type, mktime ( 0, 0, 0, $monthstr, $daystr, $yearstr ) );		return $result;	}		// 12/20/2004 10:55 AM => 2004-12-20 10:55:00	public static function TransDateTimeUI($datestr, $type = 'Y-m-d H:i:s') {		if ($datestr == Null)			return Null;		$target = $datestr;		$arr_date = preg_split ( "/\/|\s|:/", $target );		$monthstr = $arr_date [0];		$daystr = $arr_date [1];		$yearstr = $arr_date [2];		$hourstr = $arr_date [3];		$minutesstr = $arr_date [4];		$result = date ( $type, mktime ( $hourstr, $minutesstr, 0, $monthstr, $daystr, $yearstr ) );		return $result;	}		// 2004-08-31 => 08/31/2004	public static function TransDateDB($datestr, $type = 'm/d/Y') {		if ($datestr == Null)			return Null;		if ($datestr == '0000-00-00')			return Null;		$target = $datestr;		$arr_date = preg_split ( "/-/", $target );		$monthstr = $arr_date [1];		$daystr = $arr_date [2];		$yearstr = $arr_date [0];		$result = date ( $type, mktime ( 0, 0, 0, $monthstr, $daystr, $yearstr ) );		return $result;	}		// 2004-08-31 10:55:00 => 12/20/2004 10:55 AM 	public static function TransDateTimeDB($datestr, $type = 'm/d/Y h:i A') {		if ($datestr == Null)			return Null;		$target = $datestr;		$arr_date = preg_split ( "/-|\s|:/", $target );		$monthstr = $arr_date [1];		$daystr = $arr_date [2];		$yearstr = $arr_date [0];		$hourstr = $arr_date [3];		$minutesstr = $arr_date [4];		$secondstr = $arr_date [5];		$result = date ( $type, mktime ( $hourstr, $minutesstr, $secondstr, $monthstr, $daystr, $yearstr ) );		return $result;	}}?>