PHP Date Exercises : Calculate weeks between two dates

PHP date: Exercise-19 with Solution

Write a PHP script to calculate weeks between two dates.

Sample Solution:

PHP Code:

<?php
// Define a function to calculate the number of weeks between two dates
function week_between_two_dates($date1, $date2)
{
    // Create DateTime objects from the input dates with the format 'm/d/Y'
    $first = DateTime::createFromFormat('m/d/Y', $date1);
    $second = DateTime::createFromFormat('m/d/Y', $date2);
    
    // Swap the dates if the first date is greater than the second date
    if($date1 > $date2) return week_between_two_dates($date2, $date1);
    
    // Calculate the difference in days between the two dates and divide by 7 to get the number of weeks
    return floor($first->diff($second)->days/7);
}

// Define the input dates
$dt1 = '1/1/2014';
$dt2 = '12/31/2014';

// Calculate and display the number of weeks between the two dates
echo 'Weeks between '.$dt1.' and '. $dt2. ' is '. week_between_two_dates($dt1, $dt2)."\n";
?>

Output:

Weeks between 1/1/2014 and 12/31/2014 is 52

Explanation:

In the exercise above,

• function week_between_two_dates($date1, $date2) { ... }: Defines a function named week_between_two_dates that takes two date strings as input parameters.
• $first = DateTime::createFromFormat('m/d/Y', $date1);: Creates a "DateTime" object from the first date string using the format 'm/d/Y'.
• $second = DateTime::createFromFormat('m/d/Y', $date2);: Creates a "DateTime" object from the second date string using the format 'm/d/Y'.
• if($date1 > $date2) return week_between_two_dates($date2, $date1);: Checks if the first date is greater than the second date and swaps them if necessary.
• return floor($first->diff($second)->days/7);: Calculates the difference in days between the two dates using the "diff()" method of the "DateTime" object, then divides the result by 7 and returns the floor value to get the number of weeks.
• Define input dates '$dt1' and '$dt2'.
• echo 'Weeks between '.$dt1.' and '. $dt2. ' is '. week_between_two_dates($dt1, $dt2)."\n";: Calls the "week_between_two_dates()" function with the input dates and prints the result.

Flowchart :

PHP Code Editor:

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