PHP Weeks Between 2 Dates

php weeks between 2 dates

echo datediff('ww', '9 July 2003', '4 March 2004', false);

Find the function on the site below:
http://www.addedbytes.com/code/php-datediff-function/

UPDATE

Link is now broken (Sept 2017), so function below pulled from webarchive:

<?php

/**
 * @param $interval
 * @param $datefrom
 * @param $dateto
 * @param bool $using_timestamps
 * @return false|float|int|string
 */
function datediff($interval, $datefrom, $dateto, $using_timestamps = false)
{
    /*
    $interval can be:
    yyyy - Number of full years
    q    - Number of full quarters
    m    - Number of full months
    y    - Difference between day numbers
           (eg 1st Jan 2004 is "1", the first day. 2nd Feb 2003 is "33". The datediff is "-32".)
    d    - Number of full days
    w    - Number of full weekdays
    ww   - Number of full weeks
    h    - Number of full hours
    n    - Number of full minutes
    s    - Number of full seconds (default)
    */

    if (!$using_timestamps) {
        $datefrom = strtotime($datefrom, 0);
        $dateto   = strtotime($dateto, 0);
    }

    $difference        = $dateto - $datefrom; // Difference in seconds
    $months_difference = 0;

    switch ($interval) {
        case 'yyyy': // Number of full years
            $years_difference = floor($difference / 31536000);
            if (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom), date("j", $datefrom), date("Y", $datefrom)+$years_difference) > $dateto) {
                $years_difference--;
            }

            if (mktime(date("H", $dateto), date("i", $dateto), date("s", $dateto), date("n", $dateto), date("j", $dateto), date("Y", $dateto)-($years_difference+1)) > $datefrom) {
                $years_difference++;
            }

            $datediff = $years_difference;
        break;

        case "q": // Number of full quarters
            $quarters_difference = floor($difference / 8035200);

            while (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom)+($quarters_difference*3), date("j", $dateto), date("Y", $datefrom)) < $dateto) {
                $months_difference++;
            }

            $quarters_difference--;
            $datediff = $quarters_difference;
        break;

        case "m": // Number of full months
            $months_difference = floor($difference / 2678400);

            while (mktime(date("H", $datefrom), date("i", $datefrom), date("s", $datefrom), date("n", $datefrom)+($months_difference), date("j", $dateto), date("Y", $datefrom)) < $dateto) {
                $months_difference++;
            }

            $months_difference--;

            $datediff = $months_difference;
        break;

        case 'y': // Difference between day numbers
            $datediff = date("z", $dateto) - date("z", $datefrom);
        break;

        case "d": // Number of full days
            $datediff = floor($difference / 86400);
        break;

        case "w": // Number of full weekdays
            $days_difference  = floor($difference / 86400);
            $weeks_difference = floor($days_difference / 7); // Complete weeks
            $first_day        = date("w", $datefrom);
            $days_remainder   = floor($days_difference % 7);
            $odd_days         = $first_day + $days_remainder; // Do we have a Saturday or Sunday in the remainder?

            if ($odd_days > 7) { // Sunday
                $days_remainder--;
            }

            if ($odd_days > 6) { // Saturday
                $days_remainder--;
            }

            $datediff = ($weeks_difference * 5) + $days_remainder;
        break;

        case "ww": // Number of full weeks
            $datediff = floor($difference / 604800);
        break;

        case "h": // Number of full hours
            $datediff = floor($difference / 3600);
        break;

        case "n": // Number of full minutes
            $datediff = floor($difference / 60);
        break;

        default: // Number of full seconds (default)
            $datediff = $difference;
        break;
    }

    return $datediff;
}

PHP - calculating the number of weeks between two dates

The dates you pass to strtotime need to be enclosed in quotes. And the correct answer is indeed 3, as there are 3 weeks, 6 days, 23 hours and 59 minutes between the two times. Try this:

$HowManyWeeks = date( 'W', strtotime( '2019-04-21 23:59:00' ) ) - date( 'W', strtotime( '2019-03-25 00:00:00' ) );
echo $HowManyWeeks;

As has been pointed out, this will only work when the weeks are in the same year. It's easier to use DateTime objects as in @MiroslavGlamuzina answer or you can simply divide the strtotime difference by 604800 (seconds in a week); you can then take the floor or ceil if required to convert to an integer value:

$HowManyWeeks = (strtotime( '2019-04-21 23:59:00' ) - strtotime( '2019-03-25 00:00:00' )) / 604800;
echo $HowManyWeeks;

Output:

3.9939484126984

Demo on 3v4l.org

Weeks between two dates (PHP)

Use diff & calculate the number of weeks depending on the number of days -

$interval = $startDate->diff($endDate);

echo (int)(($interval->days) / 7);

Output

22

PHP Calculate Number of Weeks Between Dates and Round up to Nearest Week

You want ceil instead of round.

ceil(abs(strtotime("2016-05-20") - strtotime("2016-05-12")) / 60 / 60 / 24 / 7);

Calculate the weeks between 2 dates manually in PHP

Your approach seems overly complicated:

function weekCounter($startDate,$endDate=null){

    //use today as endDate if no date was supplied
    $endDate = $endDate? : date('Y-m-d');

    //calculate # of full weeks between dates
    $secsPerWeek = 60 * 60 * 24 * 7;
    $fullWeeks = 
            floor((strtotime($endDate) - strtotime($startDate))/$secsPerWeek);

    $fullMonths = floor($fullWeeks/4);
    $weeksRemainder = $fullWeeks % 4; // weeks that don't fit in a month

    //increment from 0-base to 1-base, so first week is Week 1. Same with months
    $fullMonths++; $weeksRemainder++;

    //return months and weeks in an array
    return [$fullMonths,$weeksRemainder];
}

You can call the function this way, and capture months and weeks:

//list() will assign the array members from weekCounter to the vars in list
list($months,$weeks) = weekCounter('2016-06-07'); //no end date, so today is used

//now $months and $weeks can be used as you wish
echo "Month: $months, Week: $weeks"; //outputs Month: 2, Week: 2

Live demo

How to get weeks between two dates

Maybe you can Count the days between your two dates and divide by 7?

PHP check if date between two dates

Edit: use <= or >= to count today's date.

This is the right answer for your code. Just use the strtotime() php function.

$paymentDate = date('Y-m-d');
$paymentDate=date('Y-m-d', strtotime($paymentDate));
//echo $paymentDate; // echos today! 
$contractDateBegin = date('Y-m-d', strtotime("01/01/2001"));
$contractDateEnd = date('Y-m-d', strtotime("01/01/2012"));
    
if (($paymentDate >= $contractDateBegin) && ($paymentDate <= $contractDateEnd)){
    echo "is between";
}else{
    echo "NO GO!";  
}

Get week numbers with start and end dates between two dates in php

Another alternative if to use DateTime class with the ->modify method. It helps to you adjusts the date via relative dates.

Here's the idea: (the markup is up to you, or put it inside an array, whichever you prefer)

$i = 1; // week number starts at 1
$date1 = new DateTime('2018-03-21');
$date2 = new DateTime('2018-05-14');
while (true) {
    echo "Week {$i}\n";
    echo $date1->format('Y-m-d'), ' - ';
    $date1->modify('next saturday');
    if ($date1 >= $date2) {
        echo $date2->format('Y-m-d');
        break; // stop the loop, reached the end date, echo the last date, or whatever you want
    }
    echo $date1->format('Y-m-d') , "\n";    
    $date1->modify('next monday'); // start again on monday
    $i++; // increment for next week
}

Here's a sample fiddle

Sidenote: If you want to know more or for in-depth info about what you can use on relative dates, here's the documentation entry:

http://php.net/manual/en/datetime.formats.relative.php

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