PHP處理日期和時間小整合

 1 date_default_timezone_set('PRC'); //預設時區 2 $t = time(); 3 $today=date("Y-m-d",time()); 4 echo "今天：$today<br />";  5 echo "某一天：".date("Y-m-d",strtotime("18 june 2008"))."<br />";  6 echo "昨天：".date("Y-m-d",strtotime("-1 day"))."<br />";  7 echo "明天：".date("Y-m-d",strtotime("+1 day"))."<br />";  8 echo "一周后：".date("Y-m-d",strtotime("+1 week"))."<br />";  9 echo "一周零兩天四小時兩秒後：".date("Y-m-d G：H：s",strtotime("+1 week 2 days 4 hours 2 seconds"))."<br />"; 10 echo "下個星期四：".date("Y-m-d",strtotime("next Thursday"))."<br />"; 11 echo "上個周一：".date("Y-m-d",strtotime("last Monday"))."<br />"; 12 echo "一個月前：".date("Y-m-d",strtotime("last month"))."<br />"; 13 echo "一個月後：".date("Y-m-d",strtotime("+1 month"))."<br />"; 14 echo "十年後：".date("Y-m-d",strtotime("+10 year"))."<br />";15 echo "<br />=======================================================<br /><br />";16 $w = date("w",time()); //擷取今天是本周周幾17 echo "今天是星期$w<br />"; 18 $d=array("日","一","二","三","四","五","六");19 $whatday="星期".$d[date("w",strtotime($today))]; //擷取今天星期幾20 echo "今天是$whatday<br />"; 21 $d0 = date("Y-m-d",strtotime("-$w day",$t)); //周開始 22 echo "本周周日是：$d0<br />"; 23 $d6 = date("Y-m-d",strtotime((6-$w)." day",$t)); //周結束 24 echo "本周周六是：$d6<br />"; 25 26 echo "本周周日是：".date("Y-m-d",strtotime("Sunday"))."<br />";  //周開始 27 echo "本周周六是：".date("Y-m-d",strtotime("Saturday"))."<br />";  //周結束28 echo "上周周日是：".date("Y-m-d",strtotime("last Sunday"))."<br />";  //上周開始 29 echo "上周周六是：".date("Y-m-d",strtotime("last Saturday"))."<br />";  //上周結束30 echo "<br />=======================================================<br /><br />";31 $time = abs((strtotime("2012-12-21") - strtotime(date("Y-m-d")))/86400);//擷取兩個日期之間的天數差32 echo "距離世界末日還有：$time 天<br />";  //上周結束