如何检查从日期到最新的两个日期 [英] how to check two dates between from-date and to-date

问题描述

我有两个日期 from-date & 至今。

I have two dates from-date & to-date.

我必须将它们与现在显示的日期进行比较，他们还是不使用php？

i可以做单日期检查，但我很困惑两个日期检查。

I have to compare them from existing dates shown below, whether any of the day fall between them or not using php?
i can do for single date checking ,but i am confuse for the two date checking.

示例：
我必须检查这些日期： - > from = 2013年3月15日& 2013年4月15日之间的日期是否在这两个日期之间。

Example: i have to check these dates:-> from=15 March 2013 & 15 April 2013 between the following dates whether any days falls in between these two date or not.

 #       from date            to-date
-----------------------------------------
1     01 April 2013         30 April 2013   //here we will find as falling
2     01 May 2013           15 May 2013   
3     01 June 2013          20 June 2013

目前，在我看来，甚至没有一个逻辑来尝试。请给我关于这个问题的任何逻辑或建议。

Currently,in my mind not even a single logic is coming to try. Please give me any logic or suggestions regarding this issue..

推荐答案

比较日期的最简单的方法是将它们转换为< a href =http://en.m.wikipedia.org/wiki/Unix_time =nofollow> unix时间戳

The simplest way to compare dates is to convert them to a unix timestamp

因为unix时间戳是一个整数，你可以简单地使用关系运算符来比较它们。

Because the unix timestamp is an integer, you can simply use relational operators to compare them.

示例

// set some example data
$referenceDate = '01 April 2013';
$fromDate = '01 January 2013';
$toDate = '01 June 2013';

// convert dates to timestamps (strings to integers)
$referenceTimestamp = strtotime( $referenceDate );
$fromTimestamp = strtotime( $fromDate );
$toTimestamp = strtotime( $toDate );

// isBetween is Boolean TRUE if reference date is greater or equal fromDate and smaller or equal toDate
$isBetween = $referenceTimestamp >= $fromTimestamp and $referenceTimestamp <= $toTimestamp;

编辑1

要真正回答您的问题：

您有两个范围需要测试重叠，这个问题已在这里回答测试两个整数范围的最有效的方法是重叠？

You have two ranges you need to test for overlap, this question has been answered here What's the most efficient way to test two integer ranges for overlap?

// our two ranges overlap if the following conditions are met
$dateRangeOverlaps = $referenceFromTimestamp <= $toTimestamp and $fromTimestamp <= $referenceToTimestamp;

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