PHP 日期運算類 DateAccount：輕鬆實現日期加減與差值計算

類別功能

DateAccount 提供兩個核心方法：

• DateAdd($interval, $number, $date)：在給定時間戳上加減指定間隔。
• DateDiff($interval, $date1, $date2)：計算兩個時間戳之間的間隔差值。

支援的間隔單位（$interval）：

使用範例

1. 加減運算

$temptime = time();
echo strftime("%Hh%M %A %d %b", $temptime); // 當前時間
$date = new DateAccount();
$temptime = $date->DateAdd("n", 50, $temptime); // 加 50 分鐘
echo "
";
echo strftime("%Hh%M %A %d %b", $temptime); // 結果時間

輸出：

15h41 Saturday 03 Jun
16h31 Saturday 03 Jun

2. 差值計算

$current = time();
$date = new DateAccount();
$new = $date->DateAdd("n", 50, $current);
$diff = $date->DateDiff("n", $current, $new);
echo "Interval between two times: $diff"; // 輸出 50

類別原始碼

<?php
class DateAccount {
    function __construct() {}

    function DateAdd($interval, $number, $date) {
        $dt = getdate($date);
        $hours = $dt["hours"]; $minutes = $dt["minutes"]; $seconds = $dt["seconds"];
        $month = $dt["mon"]; $day = $dt["mday"]; $year = $dt["year"];

        switch ($interval) {
            case "yyyy": $year += $number; break;
            case "q": $month += $number * 3; break;
            case "m": $month += $number; break;
            case "y": case "d": case "w": $day += $number; break;
            case "ww": $day += $number * 7; break;
            case "h": $hours += $number; break;
            case "n": $minutes += $number; break;
            case "s": $seconds += $number; break;
        }
        return mktime($hours, $minutes, $seconds, $month, $day, $year);
    }

    function DateDiff($interval, $date1, $date2) {
        $diff = $date2 - $date1;
        switch ($interval) {
            case "w": return bcdiv($diff, 604800);
            case "d": return bcdiv($diff, 86400);
            case "h": return bcdiv($diff, 3600);
            case "n": return bcdiv($diff, 60);
            case "s": return $diff;
        }
    }
}
?>

注意：bcdiv 需 BCMath 擴展，若環境不支援可改用 floor($diff / 86400) 等整數除法。