Code that displays the start and end points and timestamp of today, this month, last month, and this year

/**
Example of comprehensive application of php timestamp
date: 2013/2/19
link: http://bbs.it-home.org
*/
$t = time();
$t1 = mktime(0,0,0,date(“m”,$t),date(“d”,$t),date(“Y”,$t));
$t2 = mktime(0,0,0,date(“m”,$t),1,date(“Y”,$t));
$t3 = mktime(0,0,0,date(“m”,$t)-1,1,date(“Y”,$t));
$t4 = mktime(0,0,0,1,1,date(“Y”,$t));
$e1 = mktime(23,59,59,date(“m”,$t),date(“d”,$t),date(“Y”,$t));
$e2 = mktime(23,59,59,date(“m”,$t),date(“t”),date(“Y”,$t));
$e3 = mktime(23,59,59,date(“m”,$t)-1,date(“t”,$t3),date(“Y”,$t));
$e4 = mktime(23,59,59,12,31,date(“Y”,$t));
//测试
echo date(“当前 Y-m-d H:i:s”,$t).” $t”;
echo date(“今天起点 Y-m-d H:i:s”,$t1).” $t1”;
echo date(“今月起点 Y-m-d H:i:s”,$t2).” $t2”;
echo date(“上月起点 Y-m-d H:i:s”,$t3).” $t3”;
echo date(“今年起点 Y-m-d H:i:s”,$t4).” $t4”;
//测试
echo date(“今天终点 Y-m-d H:i:s”,$e1).” $e1”;
echo date(“今月终点 Y-m-d H:i:s”,$e2).” $e2”;
echo date(“上月终点 Y-m-d H:i:s”,$e3).” $e3”;
echo date(“今年终点 Y-m-d H:i:s”,$e4).” $e4”;
?>

输出结果： 当前 2011-05-24 15:42:55 1306222975 今天起点 2011-05-24 00:00:00 1306166400 今月起点 2011-05-01 00:00:00 1304179200 上月起点 2011-04-01 00:00:00 1301587200 今年起点 2011-01-01 00:00:00 1293811200 今天终点 2011-05-24 23:59:59 1306252799 今月终点 2011-05-31 23:59:59 1306857599 上月终点 2011-04-30 23:59:59 1304179199 今年终点 2011-12-31 23:59:59 1325347199