检查重复日期 [英] Check for repeating dates

问题描述

我正在用PHP创建一个日历，并且在数据库中有一个日期，例如10-10-6。

I am creating a calendar in PHP and in the database have a date, let's say 6-10-10.

有时我有重复的事件，每周存储一次重复，所以如果日期是6-10-10，而我要从那天（包括那天）起每两周重复一次事件，什么是从6-10-10开始每两周查找日期的最佳方法是什么？

Sometimes I have repeating events, stored as weekly repeating, so if the date is 6-10-10, and I am repeating an event every two weeks from that day (including that day) what is the best way to find dates for every two weeks from 6-10-10?

例如，假设日期为7-8-10，如何检查日期是否符合我的条件？

For example, let's say the date is 7-8-10, how can I check to see that date meets my criteria?

推荐答案

循环是怎么回事？！离散数学101：如何计算数字是否为偶数？ n％2 == 0

What's up with the looping?! Discrete Math 101: How do you figure out if a number is even? n%2==0

您如何确定日期是否是两周一次？ date％2weeks == 0

How do you figure out if a date is (uh...) biweekly? date%2weeks==0

折腾而后得到（date- startdate）％2weeks

$startdate = strtotime("10 June 2010");
$otherdate = strtotime("8 July 2010");
$twoweeks  = strtotime("+2 weeks") - time();
if($otherdate>$startdate && (($otherdate-$startdate)%$twoweeks)==0) {
    // this is n * two weeks after
}

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