Find out if date is between two dates, ignoring year

Question

I need to determine if a date (month and day) is between two other month/days.

I\'ve attached an image to this post that describes what I\'m trying to do. Basically

Answer 1

To solve this, you can convert your dates to 4-digit numbers of the form MMDD.

$start = '1122';
$end = '0315';
$date = '0201';

If you don't yet have your dates formatted like this, you can use date('md', $timestamp), or just calculate the number by taking $month * 100 + $day;

Then your test logic will change depending on whether you're crossing a year boundary or not. Putting it all together, it might look like this:

function isDateBetween($testM, $testD, $startM, $startD, $endM, $endD) {
    $start = $startM*100 + $startD;
    $end = $endM*100 + $endD;
    $date = $testM*100 + $testD;

    if ($start > $end) {
        // crossing a year boundary
        return ($date > $start) || ($date < $end);
    } else {
        // not crossing a year
        return ($date > $start) && ($date < $end);
    }
}

Here's some examples of calling this function:

// your example given above
isDateBetween(2, 1, 11, 22, 3, 15); // true

// ends the day after instead
isDateBetween(3, 16, 11, 22, 3, 15); // false

// reverse the dates in your example
isDateBetween(2, 1, 3, 15, 11, 22); // false

// ends the day after, with reversed dates
isDateBetween(3, 16, 3, 15, 11, 22); // true