Cross-browser console.time, console.timeCapture & console.timeEnd implementation.

console.time.js

if ( console && console.log ) {

    console._timeStamps = {};

    console.time = function(name){
        console._timeStamps[name] = new Date();
        console.log(name + ': ' + console._timeStamps[name]);
    };

    console.timeCapture = function(name){
        if ( console._timeStamps[name] ) {
            var timeStamp = +new Date() - +console._timeStamps[name];
            var seconds = Math.floor(timeStamp / 1000);
            var minutes = Math.floor(seconds / 60);
            var hours = Math.floor(minutes / 60);
            var timeStr = name + ':';
            if ( hours >= 1 ) {
                timeStr += ' ' + hours + 'h';
            }
            if ( minutes >= 1 ) {
                timeStr += ' ' + minutes + 'm';
            }
            if ( seconds >= 1 ) {
                timeStr += ' ' + seconds + 's';
            }
            if ( timeStamp >= 1 ) {
                timeStr += ' ' + timeStamp % 1000 + 'ms';
            }
            console.log(timeStr);
            return;
        }
        console.log(name + ' is not found');
    };

    console.timeEnd = function(name){
        console.timeCapture(name);
        delete console._timeStamps[name];
    };
}