Error calculating the number of days since the start of the year-CodePudding

I'm trying to calculate the number of days since a specific date, but an error surfaces at the 87th day, and lasts till the 303th day, before it returns to normal. The error is always bellow the number with a decimal number of .958333333333.

function findDays($day, $month) {return   ( (mktime(0, 0, 1, $month, $day)-strtotime("2022-01-01 00:00:01"))/86400) 1;}


$months=[31,28,31,30,31,30,31,31,30,31,30,31]; 
for($i=0;$i<12;$i  ){ 
    echo "<br>month-".($i 1).": ";
    for($j=0;$j<$months[$i];$j  ){
        $days= findDays($j 1, $i 1);
        echo $days." | ";
    } 
}

CodePudding user response：

If you simply want to know for a particular date how many days have passed since the start of the year, you can use a date format:

function findDays($day, $month) {
    return DateTime::createFromFormat('m-d', $month . '-' . $day)
               ->format('z');
}

For today, April 1st 2022, that returns 90 (if you don't provide a year in the DateTime format, the current year is used).

If you want to get the number of days since a specific date, you can use a DateInterval:

function findDays($day, $month) {
    $baseDate = new DateTime("2020-01-01");

    return DateTime::createFromFormat('m-d', $month . '-' . $day)
               ->diff($baseDate)
               ->days;
}

For today, that returns that 821 days have passed since January 1st 2020.