how do i calculate number of days between two dates in php code example

Example 1: Get the number of days between two dates in PHP

$startDate = new DateTime("2019-10-27");
$endDate = new DateTime("2020-04-11");

$difference = $endDate->diff($startDate);
echo $difference->format("%a");

Example 2: how to calculate days between two dates in php

<?php
function dateDifference($start_date, $end_date)
{
    // calulating the difference in timestamps 
    $diff = strtotime($start_date) - strtotime($end_date);
     
    // 1 day = 24 hours 
    // 24 * 60 * 60 = 86400 seconds
    return ceil(abs($diff / 86400));
}
 
// start date 
$start_date = "2016-01-02";
 
// end date 
$end_date = "2016-01-21";
 
// call dateDifference() function to find the number of days between two dates
$dateDiff = dateDifference($start_date, $end_date);
 
echo "Difference between two dates: " . $dateDiff . " Days ";
?>

Example 3: php calculate weeks between two dates

function numWeeks($dateOne, $dateTwo){
    //Create a DateTime object for the first date.
    $firstDate = new DateTime($dateOne);
    //Create a DateTime object for the second date.
    $secondDate = new DateTime($dateTwo);
    //Get the difference between the two dates in days.
    $differenceInDays = $firstDate->diff($secondDate)->days;
    //Divide the days by 7
    $differenceInWeeks = $differenceInDays / 7;
    //Round down with floor and return the difference in weeks.
    return floor($differenceInWeeks);
}

$numOfWeek = numWeeks('2021-01-21', '2021-01-28');