Question 40282 in PHP Question posted in
Official manual can be found here.

why does Carbon::parse('2023-11-30')->diffInMonths(Carbon::parse('2023-10-01'), false); return 1 instead of 2? – PHP

When I try to use carbon diffInMonths() it gives me values less 1, why is that?

$months = Carbon::parse('2023-11-30')->diffInMonths(Carbon::parse('2023-10-01'), false);

//$months = 1 instead of 2

What am I doing wrong?

I am manually adding 1 after results which is dangerous.

Tags:

2

Answers


  1. 0

    The diffInMonths() method in Carbon calculates the difference between two dates in months. However, it rounds down the result to the nearest whole number. In your example, the difference between ‘2023-11-30’ and ‘2023-10-01’ is 1 month and 29 days, which is less than 2 full months. Therefore, the method returns 1.

    To round up the result of Carbon’s diffInMonths() when there’s a partial month:

    • Calculate the difference in months using diffInMonths().
    • Check if there are remaining days after subtracting the month difference.
    • Add 1 to the result if there are any remaining days.
    
    $date1 = Carbon::parse('2023-11-30');
    $date2 = Carbon::parse('2023-10-01');
        
    $months = $date1->diffInMonths($date2, false);
        
    // Check if there are remaining days after calculating the month difference
    if ($date1->copy()->subMonths($months)->gt($date2)) {
        $months++;
    }  
    
    echo $months; // Output: 2

    This will calculate the difference in months and add 1 if there are any remaining days after subtracting the month difference. This way, you will get 2 as the result in your example, and you won’t need to manually add 1 to the result.

    Login or Signup to reply.
  2. 0

    If you want rounded diff:

    $months = round(Carbon::parse('2023-11-30')->floatDiffInMonths(Carbon::parse('2023-10-01'), false));
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search