$.fn.genTimer = function(options) {

    var defaults = {

        beginTime: (new Date()),

        unitWord: {

            hours: ":",

            minutes: ":",

            seconds: ""

        },

        callbackOnlyDatas: false

    };

    var DAY_MILLISECOND = 1000 * 60 * 60 * 24;

    var opts = $.extend({},

    defaults, options);

    var _this = this;

    var day_label = "D";

    var days_label = "D";

    var callback = function() {

        if (duration < 0) {

            opts.callback.call(_this, opts.callbackOnlyDatas ? {

                hours: '00',

                minutes: '00',

                seconds: '00',

                dates: 0

            }: "00" + opts.unitWord.hours + "00" + opts.unitWord.minutes + "00");

            clearInterval(_this.interval)

        } else {

            var viewDuration = calcView(duration);

            if (opts.callbackOnlyDatas) {

                opts.callback.call(_this, viewDuration)

            } else {

                if (duration >= DAY_MILLISECOND * 2) {

                    opts.callback.call(_this, '<span class="day_count" style="display:none;">' + viewDuration.dates + '</span><span class="day" style="display:none;">' + days_label + '</span> <span class="day_seconds">' + viewDuration.hours + opts.unitWord.hours + viewDuration.minutes + opts.unitWord.minutes + viewDuration.seconds + opts.unitWord.seconds + '</span>')

                } else if (duration >= DAY_MILLISECOND) {

                    opts.callback.call(_this, '<span class="day_count" style="display:none;">' + viewDuration.dates + '</span><span class="day" style="display:none;">' + day_label + '</span> <span class="day_seconds">' + viewDuration.hours + opts.unitWord.hours + viewDuration.minutes + opts.unitWord.minutes + viewDuration.seconds + opts.unitWord.seconds + '</span>')

                } else {

                    opts.callback.call(_this, '<span class="seconds">' + viewDuration.hours + opts.unitWord.hours + viewDuration.minutes + opts.unitWord.minutes + viewDuration.seconds + opts.unitWord.seconds + '</span>')

                }

            }

        }

        duration -= 1000

    };

    _this.interval = setInterval(callback, 1000);

    opts.targetTime = opts.targetTime.replace(/\-/g, "/");

    opts.beginTime = opts.beginTime.replace(/\-/g, "/");

    var duration = new Date(opts.targetTime) - new Date(opts.beginTime);

    callback();

    function calcView(duration) {

        var dates = Math.floor(duration / DAY_MILLISECOND);

        var hours = Math.floor((duration - dates * DAY_MILLISECOND) / (1000 * 60 * 60));

        var minutes = Math.floor((duration - dates * DAY_MILLISECOND - hours * 1000 * 60 * 60) / (1000 * 60));

        var seconds = Math.floor((duration - dates * DAY_MILLISECOND - hours * 1000 * 60 * 60 - minutes * 1000 * 60) / 1000);

        return {

            hours: ('0' + hours).slice( - 2),

            minutes: ('0' + minutes).slice( - 2),

            seconds: ('0' + seconds).slice( - 2),

            dates: dates

        }

    }

};