計算一周中的天數
當給定週數時,例如從日期-u %W 獲得的,我們可能需要計算該週內的天數(從星期一開始)。這使我們能夠產生該週內的特定日期清單。
PHP 實作
在PHP 中,我們可以利用循環來產生日期:
<code class="php">$week_number = 40; $year = 2008; for ($day = 1; $day <= 7; $day++) { echo date('m/d/Y', strtotime($year . "W" . $week_number . $day)) . "\n"; }
輸出:
10/06/2008 10/07/2008 10/08/2008 10/09/2008 10/10/2008 10/11/2008 10/12/2008
輸出:
輸出:<code class="php">function week_from_monday($date) { // Assuming $date is in format DD-MM-YYYY list($day, $month, $year) = explode("-", $date); // Get the weekday of the given date $wkday = date('l', mktime(0, 0, 0, $month, $day, $year)); switch ($wkday) { case 'Monday': $numDaysToMon = 0; break; case 'Tuesday': $numDaysToMon = 1; break; case 'Wednesday': $numDaysToMon = 2; break; case 'Thursday': $numDaysToMon = 3; break; case 'Friday': $numDaysToMon = 4; break; case 'Saturday': $numDaysToMon = 5; break; case 'Sunday': $numDaysToMon = 6; break; } // Timestamp of the Monday for that week $monday = mktime(0, 0, 0, $month, $day - $numDaysToMon, $year); $seconds_in_a_day = 86400; // Get date for 7 days from Monday (inclusive) for ($i = 0; $i < 7; $i++) { $dates[$i] = date('Y-m-d', $monday + ($seconds_in_a_day * $i)); } return $dates; }
Array ( [0] => 2008-10-06 [1] => 2008-10-07 [2] => 2008-10-08 [3] => 2008-10-09 [4] => 2008-10-10 [5] => 2008-10-11 [6] => 2008-10-12 )</code>
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