php时间的加减法

<?php
// 获取当前时间
$current_time = time();

// 增加一天
$future_time = strtotime("+1 day", $current_time);
echo "Future Time: " . date("Y-m-d H:i:s", $future_time) . "\n";

// 减少一小时
$past_time = strtotime("-1 hour", $current_time);
echo "Past Time: " . date("Y-m-d H:i:s", $past_time) . "\n";

// 计算两个日期之间的差值
$date1 = strtotime("2023-10-01");
$date2 = strtotime("2023-10-10");
$diff = $date2 - $date1;
echo "Difference in days: " . ($diff / (60 * 60 * 24)) . "\n";
?>

date_default_timezone_set('Asia/Shanghai');
$current_time = time();
$future_time = strtotime("+1 day", $current_time);
echo "Future Time: " . date("Y-m-d H:i:s", $future_time) . "\n";

$current_time = time();
$future_year_time = strtotime("+1 year", $current_time);
echo "Future Year Time: " . date("Y-m-d H:i:s", $future_year_time) . "\n";