php 时间日期工具类
如果系统没有设置时区，那么获得的结果是UTC时间，相对中国用户来说，就是相差了8个小时<?phpDateTimeUtils::addDate('2012-12-01',1,'y');DateTimeUtils::getWeekDay('2012/10/01','/');DateTimeUtils::isLeapYear('2012');DateTimeUtils::timeFromNow(strtotime("2012-10-26 14:15:13"));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 leapelse 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, $date);return self::isValidDate ($dateArr, $dateArr, $dateArr);}/** * 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, $time);return self::isValidTime($timeArr, $timeArr,$timeArr);}public static function addDate($date, $int, $unit = "d") { //日期的增加$value = array('y'=>'', 'm'=>'', 'd'=>'');$dateArr = explode ( "-", $date);if(array_key_exists($unit, $value)){$value[$unit] = $int;}else{return false;}return date ("Y-m-d", mktime (0, 0, 0, $dateArr + $value['m'], $dateArr + $value['d'], $dateArr +$value['y']));}public static function addDateTime($date, $int, $unit = "d") { //日期的增加$value = array('y'=>'', 'm'=>'', 'd'=>'', 'h'=>'', 'i'=>'');$dateArr = preg_split ( "/-|\s|:/", $date);if(array_key_exists($unit, $value)){$value[$unit] = $int;}else{return false;}return date ("Y-m-d H:i:s", mktime($dateArr+ $value['h'], $dateArr+ $value['i'], $dateArr, $dateArr + $value['m'], $dateArr + $value['d'], $dateArr + $value['y']));}public static function addDayTimestamp($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 $oktime;}public static function dateDiff($begin, $end, $unit = "d") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天$diff = strtotime($end) - strtotime($begin);switch($unit){case "y": $retval = bcdiv($diff, (60 * 60 * 24 * 365)); break;case "m": $retval = bcdiv($diff, (60 * 60 * 24 * 30)); break;case "w": $retval = bcdiv($diff, (60 * 60 * 24 * 7)); break;case "d": $retval = bcdiv($diff, (60 * 60 * 24)); break;case "h": $retval = bcdiv($diff, (60 * 60)); break;case "i": $retval = bcdiv($diff, 60); break;case "s": $retval = $diff; break;}return $retval;}public static function getWeekDay($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, $dateArr, $dateArr));}public static function timeFromNow($dateline) { //让日期显示为:XX天XX年以前if(empty($dateline)) return false;$seconds = time() - $dateline;if($seconds < 60){return "1分钟前";}elseif($seconds < 3600){return floor($seconds/60)."分钟前";}elseif($seconds< 24*3600){return floor($seconds/3600)."小时前";}elseif($seconds < 48*3600){return date("昨天 H:i", $dateline)."";}else{return date('Y-m-d', $dateline);}}public static function transDateToChs($date) {if (empty ($date)) return '今日';date_default_timezone_set('PRC');$dates = date ('Y年m月d日', strtotime ($date));return $dates;}// 08/31/2004 => 2004-08-31public static function TransDateUI($datestr, $type = 'Y-m-d') {if ($datestr == Null)return Null;$target = $datestr;$arr_date = preg_split ( "/\//", $target);$monthstr = $arr_date;$daystr = $arr_date;$yearstr = $arr_date;$result = date ($type, mktime (0, 0, 0, $monthstr, $daystr, $yearstr));return $result;}// 12/20/2004 10:55 AM => 2004-12-20 10:55:00public static function TransDateTimeUI($datestr, $type = 'Y-m-d H:i:s') {if ($datestr == Null)return Null;$target = $datestr;$arr_date = preg_split ( "/\/|\s|:/", $target);$monthstr = $arr_date;$daystr = $arr_date;$yearstr = $arr_date;$hourstr = $arr_date;$minutesstr = $arr_date;$result = date ($type, mktime ($hourstr, $minutesstr, 0, $monthstr, $daystr, $yearstr));return $result;}}?>
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