function showdate() {
    week = new Array("يكشنبه", "دوشنبه", "سه شنبه", "چهارشنبه", "پنج شنبه", "جمعه", "شنبه")
    months = new Array("فروردين", "ارديبهشت", "خرداد", "تير", "مرداد", "شهريور", "مهر", "آبان", "آذر", "دی", "بهمن", "اسفند");
    a = new Date();
    d = a.getDay();
    day = a.getDate();
    month = a.getMonth() + 1;
    year = a.getYear();

    year = (year == 0) ? 2000 : year;
    (year < 1000) ? (year += 1900) : true;

    year -= ((month < 3) || ((month == 3) && (day < 21))) ? 622 : 621;

    switch (month) {
        case 1: (day < 21) ? (month = 10, day += 10) : (month = 11, day -= 20); break;
        case 2: (day < 20) ? (month = 11, day += 11) : (month = 12, day -= 19); break;
        case 3: (day < 21) ? (month = 12, day += 9) : (month = 1, day -= 20); break;
        case 4: (day < 21) ? (month = 1, day += 11) : (month = 2, day -= 20); break;
        case 5:
        case 6: (day < 22) ? (month -= 3, day += 10) : (month -= 2, day -= 21); break;
        case 7:
        case 8:
        case 9: (day < 23) ? (month -= 3, day += 9) : (month -= 2, day -= 22); break;
        case 10: (day < 23) ? (month = 7, day += 8) : (month = 8, day -= 22); break;
        case 11:
        case 12: (day < 22) ? (month -= 3, day += 9) : (month -= 2, day -= 21); break;
        default: break;
    }
    document.write(week[d] + " " + day + " " + months[month - 1] + " " + year);
}