PHP查找最接近时间轴周期的日期

Question

So, uh, ok. This might get mathematical, so hope you brought your scientific calculator with you ;)

This is my problem:

Given an initial date (timestamp), time period period (seconds) and today's date (timestamp), I need to find the nearest date which coincides with the period*n plus the original/initial date.

So far, I got some stuff working nicely, such as the amount of "periods" between the initial and final(today's) date, which would be "2" in the demo above:

$initial=strtotime('2 April 1991');
$time=time();
$period=strtotime('+10 years',0);

$periods=round(($time-$initial)/$period);

The next thing I did was:

$range=$periods*$period;

And finally:

echo date('d M Y',$initial+$range);

Which wrote '03 April 2011'. How did it get to 3? (I suspect it's a leap year issue?) You know that feeling when you're missing something small? I'm feeling it all over me right now....

Answer 1

Try this out:

$current = $initial = strtotime('2 April 1991');
$time_span = '+10 years';

while ($current < time())
{ 
  $current = strtotime($time_span, $current);
}

echo date('d M Y', $current);