从日期中减去一定数量的小时、天、月或年

2021-12-23 00:00:00 datetime time timestamp date php

我正在尝试创建一个简单的函数，它返回一个从现在开始减去一定天数的日期，所以类似这样的事情，但我不太了解日期类:

I'm trying to create a simple function which returns me a date with a certain number of subtracted days from now, so something like this but I dont know the date classes well:

<?
function get_offset_hours ($hours) {
    return date ("Y-m-d H:i:s", strtotime (date ("Y-m-d H:i:s") /*and now?*/));
}

function get_offset_days ($days) {
    return date ("Y-m-d H:i:s", strtotime (date ("Y-m-d H:i:s") /*and now?*/));
}

function get_offset_months ($months) {
    return date ("Y-m-d H:i:s", strtotime (date ("Y-m-d H:i:s") /*and now?*/));
}

function get_offset_years ($years) {
    return date ("Y-m-d H:i:s", strtotime (date ("Y-m-d H:i:s") + $years));
}

print get_offset_years (-30);
?>

有没有可能做类似的事情?这种功能可以用很多年，但是其他时间类型怎么做呢?

Is it possible to do something similar to this? this kind of function works for years, but how to do the same with other time types?

推荐答案

几个小时:

function get_offset_hours($hours)
{
    return date('Y-m-d H:i:s', time() + 3600 * $hours);
}

这样的东西可以在数小时和数天内正常工作(使用 86400 数天)，但对于数月和数年，它有点棘手......

Something like that will work well for hours and days (use 86400 for days), but for months and year it's a bit trickier...

你也可以这样做:

$date = strtotime(date('Y-m-d H:i:s') . ' +1 day');
$date = strtotime(date('Y-m-d H:i:s') . ' +1 week');
$date = strtotime(date('Y-m-d H:i:s') . ' +2 weeks');
$date = strtotime(date('Y-m-d H:i:s') . ' +1 month');
$date = strtotime(date('Y-m-d H:i:s') . ' +30 days');
$date = strtotime(date('Y-m-d H:i:s') . ' +1 year');

echo(date('Y-m-d H:i:s', $date));

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