Calculating the time difference(in hours and minutes) using strtotime() [closed]

问题

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Closed 7 years ago.

$time1 = strtotime('23:56');
$time2 = strtotime('00:21');
echo ($time1 - $time2)/60;

The expected o/p is 25.But it returns 1415;

If I change

$time2= strtotime('24:21');

It returns -25 which is partially correct(since it returns negative ).

Can any one suggest me, some other function to calculate time difference in minutes.

Thanks :)

回答1:

if you use strtotime with only a time it takes the current date so:

$time1 = strtotime('23:56');  // 2012-12-06 23:56
$time2 = strtotime('00:21');  // 2012-12-06 00:21
echo ($time1 - $time2)/60;

回答2:

This is because you are not specifying a day, so 00:21 is the start of today and 23:56 is the end of today

1415 being the 23 hours difference.

回答3:

Assume that $time2 must be greater than or equal to $time1. Then adjust $time2 accordingly:

Example 1 -- same day

$time1 = strtotime('00:21');
$time2 = strtotime('23:56');
if($time2 < $time1) {
    $time2 += 24 * 60 * 60;
}
echo ($time2 - $time1) / 60; // 1415

Example 2 -- day rolls over

$time1 = strtotime('23:56');
$time2 = strtotime('00:21');
if($time2 < $time1) {
    $time2 += 24 * 60 * 60;
}
echo ($time2 - $time1) / 60; // 25

回答4:

php's answer is correct, how should it know that you think about the next day? Just subtract your value from 1440 (Minutes in a day), then you'll have the desired result...

回答5:

The expected output is not 25. You're subtracting an early time of day from a late time of day. 11:56 PM - 12:21 AM is almost 24 hours (or 1440 minutes).

Your result is 1415 which is exactly what's expected.

回答6:

You can save the timestamp of $temp and use date function

 $time1 = timestamp;
$time2 = timestamp;
$temp  = $time1 - $time2;

echo date("F j Y i:s",$temp);

来源：https://stackoverflow.com/questions/13741507/calculating-the-time-differencein-hours-and-minutes-using-strtotime