exports.at = at;

function at(hours, minutes) {

var min = 1000 * 60;

var hr = min * 60;

var clock = {};

var value = (~~hours * hr) + (~~minutes * min);

clock.valueOf = function () {

return value;

};

clock.toString = function () {

var time = new Date(value).toISOString().split('T')[1].split(':');

return time[0] + ":" + time[1];

};

clock.plus = function (minutes) {

value += ~~minutes * min;

return clock;

};

clock.minus = function (minutes) {

value -= ~~minutes * min;

return clock;

};

clock.equals = function (other) {

return +clock === +other;

};

return Object.create(clock);

};