找出第n个星期的星期一在PHP中的日期吗? [英] Find out date of nth week's monday in PHP?

问题描述

我有一个简单的情况，我有一个用户提供了第X周，我需要找出该周的星期一日期(例如12月12日).我将如何实现呢?我知道年和周.

I have a simple situation where I have a user supplied week number X, and I need to find out that week's monday's date (e.g. 12 December). How would I achieve this? I know year and week.

推荐答案

某些代码主要基于先前的建议:

Some code based mainly on previous proposals:

$predefinedYear = 2009;
$predefinedWeeks = 47;

// find first mоnday of the year
$firstMon = strtotime("mon jan {$predefinedYear}");

// calculate how much weeks to add
$weeksOffset = $predefinedWeeks - date('W', $firstMon);

// calculate searched monday
$searchedMon = strtotime("+{$weeksOffset} week " . date('Y-m-d', $firstMon));

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