<?php DateTimeUtils::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 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, $date); return self::isValidDate ($dateArr[0], $dateArr[1], $dateArr[2]); } /** * 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[0], $timeArr[1],$timeArr[2]); } 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[1] + $value['m'], $dateArr[2] + $value['d'], $dateArr[0] +$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[3]+ $value['h'], $dateArr[4]+ $value['i'], $dateArr[5], $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 $oktime; } public static function dateDiff($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[1], $dateArr[2], $dateArr[0])); } public static function timeFromNow($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 $dates; } // 08/31/2004 => 2004-08-31 public static function TransDateUI($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; } } ?>