在PHP中查找上个月的最后一天 [英] Finding Last Day of Previous Month in PHP

问题描述

我有点不确定为什么无法找到上个月的最后一天.除了创建最终日期以外，每个步骤似乎都可以正常工作.

I'm a little unsure why this is not able to find the last day of the previous month. Every steps seems to be working correctly, except when the final date is created.

<?php

$currentMonth = date('n');
$currentYear = date('Y');

if($currentMonth == 1) {
    $lastMonth = 12;
    $lastYear = $currentYear - 1;
}
else {
    $lastMonth = $currentMonth -1;
    $lastYear = $currentYear;
}

if($lastMonth < 10) {
    $lastMonth = '0' . $lastMonth;
}

$lastDayOfMonth = date('t', $lastMonth);

$lastDateOfPreviousMonth = $lastYear . '-' . $lastMonth . '-' . $lastDayOfMonth;

$newLastDateOfMonth = date('F j, Y', strtotime($lastDateOfPreviousMonth));

?>

$lastDateOfPreviousMonth将按预期返回2012-09-30；但是，在尝试将其转换为2012年9月30日之后-$newLastDateOfMonth将在2012年10月1日返回.我似乎在哪里出错了?

$lastDateOfPreviousMonth is returning 2012-09-30 as expected; however, after trying to convert it to September 30, 2012 - $newLastDateOfMonth is returning October 1, 2012. Where do I seem to be going wrong?

如果使用date("t/m/Y", strtotime("last month"));或date('Y-m-d', strtotime('last day of previous month'));，在2013年1月1日给出的建议中，这两种方法仍然可行，也就是说，它们是否会说明年份的变化?

If using date("t/m/Y", strtotime("last month")); or date('Y-m-d', strtotime('last day of previous month')); will either of these still be viable given 2013-01-01, i.e. will they account for the change in year?

推荐答案

echo date('Y-m-d', strtotime('last day of previous month'));
//2012-09-30

或

$date = new DateTime();
$date->modify("last day of previous month");
echo $date->format("Y-m-d");

稍后 php.net文档-strtotime()的相对格式，DateTime和date_create()

这篇关于在PHP中查找上个月的最后一天的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！