class Timestamp {

    DEFAULT_FORMAT = "Y-m-d H:i:s P";

    #date;

    constructor(init, options = {}) {
        if (init === 'now') {
            this.#date = new Date();
        } else if (init && init.match(/^(\d{4})-(\d{2})-(\d{2}) (\d{2}):(\d{2}):(\d{2}) (.+?)$/)) {
            let { year, month, day, hour, minute, second, timezone } = init.replace('-',' ').split();
            let h = null, m = null;
            if (timezone.indexOf(':') !== false) {
                let { h, m } = timezone.split(':');
            } else {
                h = timezone;
            }
            this.#date = new Date(year, month, day, hour, minute, second, 0);
            h = parseInt(h);
            m = parseInt(m);
            let t = this.#date.getTime();
            let d = ((h * 3600) + (m * 60) * 1000);
            this.#date.setTime(t -d );
        }
    }

    get date() {
        return this.#date;
    }

    get time() {
        return this.format('H:i:s');
    }

    set time(time) {

    }

    add(periods) {
        // return new 
    }

    sub(periods) {
        // return new
    }

    time(time) {
        // return new
    }

    diff(other) {
        // return diff
    }

    format(format) {
        
        // format date
    }

    toString() {
        return this.format(this.DEFAULT_FORMAT);
    }

}


function date(when = "now") {
    return new Timestamp(when);
}


export {
    Timestamp,
    date
};