Converting Youtube Data API V3 video duration format to seconds in JavaScript/Node.js

Question

I'm trying to convert ISO 8601 string to seconds in JS/Node. The best I could come up with was:

function convert_time(duration) {
    var a = duration.match(/\d+/g)
    var duration = 0

    if(a.length == 3) {
        duration = duration + parseInt(a[0]) * 3600;
        duration = duration + parseInt(a[1]) * 60;
        duration = duration + parseInt(a[2]);
    }

    if(a.length == 2) {
        duration = duration + parseInt(a[0]) * 60;
        duration = duration + parseInt(a[1]);
    }

    if(a.length == 1) {
        duration = duration + parseInt(a[0]);
    }
    return duration
}

It works when I input strings such as "PT48S", "PT3M20S" or "PT3H2M31S", but fails miserably if the string is "PT1H11S". Does anyone have a better idea?

Answer 1

If you're using moment.js you can simply call...

moment.duration('PT15M33S').asMilliseconds();

= 933000 ms

EDIT 2021: While this works, and still gets upvotes, I wouldn't advise including moment.js just for this. I'd recommend using a regex answer like @redgetan's

Answer 2

function YTDurationToSeconds(duration) {
  var match = duration.match(/PT(\d+H)?(\d+M)?(\d+S)?/);

  match = match.slice(1).map(function(x) {
    if (x != null) {
        return x.replace(/\D/, '');
    }
  });

  var hours = (parseInt(match[0]) || 0);
  var minutes = (parseInt(match[1]) || 0);
  var seconds = (parseInt(match[2]) || 0);

  return hours * 3600 + minutes * 60 + seconds;
}

works for these cases:

PT1H
PT23M
PT45S
PT1H23M
PT1H45S
PT23M45S
PT1H23M45S

Answer 3

I suggest this little hack to prevent your problematic case:

function convert_time(duration) {
    var a = duration.match(/\d+/g);

    if (duration.indexOf('M') >= 0 && duration.indexOf('H') == -1 && duration.indexOf('S') == -1) {
        a = [0, a[0], 0];
    }

    if (duration.indexOf('H') >= 0 && duration.indexOf('M') == -1) {
        a = [a[0], 0, a[1]];
    }
    if (duration.indexOf('H') >= 0 && duration.indexOf('M') == -1 && duration.indexOf('S') == -1) {
        a = [a[0], 0, 0];
    }

    duration = 0;

    if (a.length == 3) {
        duration = duration + parseInt(a[0]) * 3600;
        duration = duration + parseInt(a[1]) * 60;
        duration = duration + parseInt(a[2]);
    }

    if (a.length == 2) {
        duration = duration + parseInt(a[0]) * 60;
        duration = duration + parseInt(a[1]);
    }

    if (a.length == 1) {
        duration = duration + parseInt(a[0]);
    }
    return duration
}

Fiddle

Answer 4

Here's my solution:

function parseDuration(duration) {
    var matches = duration.match(/[0-9]+[HMS]/g);

    var seconds = 0;

    matches.forEach(function (part) {
        var unit = part.charAt(part.length-1);
        var amount = parseInt(part.slice(0,-1));

        switch (unit) {
            case 'H':
                seconds += amount*60*60;
                break;
            case 'M':
                seconds += amount*60;
                break;
            case 'S':
                seconds += amount;
                break;
            default:
                // noop
        }
    });

    return seconds;
}

Answer 5

You can find a very simple PHP solution here - How To Convert Youtube API Time (ISO 8601 String Video Duration) to Seconds In PHP - Code

This function convert_time() takes one parameter as input - the Youtube API Time (Video Duration) which is in ISO 8601 string format and returns its duration in seconds.

function convert_time($str) 
{
    $n = strlen($str);
    $ans = 0;
    $curr = 0;
    for($i=0; $i<$n; $i++)
    {
        if($str[$i] == 'P' || $str[$i] == 'T')
        {

        }
        else if($str[$i] == 'H')
        {
            $ans = $ans + 3600*$curr;
            $curr = 0;
        }
        else if($str[$i] == 'M')
        {
            $ans = $ans + 60*$curr;
            $curr = 0;
        }
        else if($str[$i] == 'S')
        {
            $ans = $ans + $curr;
            $curr = 0;
        }
        else
        {
            $curr = 10*$curr + $str[$i];
        }
    }
    return($ans);
}

Testing Some Inputs:

"PT2M23S" => 143
"PT2M" => 120
"PT28S" => 28
"PT5H22M31S" => 19351
"PT3H" => 10800
"PT1H6M" => 3660
"PT1H6S" => 3606