Time circular mean calculation

MeanTimeOfDay.js

/**
 * Created by ffarias on 2/4/14.
 */

var meanTimeOfDay =
{

    timeToDegrees: function (datetime) {
        return (360 * datetime.getHours() / 24.0 + 360 * datetime.getMinutes() / (24 * 60.) + 360 * datetime.getSeconds() / (24 * 3600.0));
    },

    timeFromDegrees: function (angle) {
        var time = {};
        var totalSeconds = 24 * 60 * 60 * angle / 360;
        time.seconds = Math.floor(totalSeconds % 60);
        time.minutes = Math.floor((totalSeconds % 3600 - time.seconds) / 60);
        time.hours = Math.floor(totalSeconds / 3600);

        return time;
    },

    meanAngle: function (angles) {
        var y_part = 0;
        var x_part = 0;

        for (var i=0; i < angles.length; i++)
        {
            x_part += Math.cos(angles[i] * Math.PI / 180);
            y_part += Math.sin(angles[i] * Math.PI / 180);

        }
        return Math.atan2(y_part/angles.length, x_part/angles.length) * 180 / Math.PI;
    },

    // Input hours: 23:00:17 23:40:20 00:12:45 00:17:19
    // Expected result: "The mean time is : 23:47:43"

    calculateMeanTimeOfDay: function (){
        var input = [
            new Date(2014,2,4,23,0,17),
            new Date(2014,2,4,23,40,20),
            new Date(2014,2,5,0,12,45),
            new Date(2014,2,5,0,17,19)
        ];

        var inputOnDegrees = new Array();
        for (var i = 0; i < input.length; i++) {
            inputOnDegrees.push(this.timeToDegrees(input[i]));
        }
        var meanTime = this.timeFromDegrees( 360 + this.meanAngle(inputOnDegrees));
        console.log('Hours' + meanTime.hours, ' Min' + meanTime.minutes, ' Seconds' + meanTime.seconds);
    }
}

meanTimeOfDay.calculateMeanTimeOfDay();