java snippets

GregorianCalendar example using String.format

        // get the supported ids for GMT-05:00 (Eastern Standard Time)
        String[] ids = TimeZone.getAvailableIDs(-5 * 60 * 60 * 1000);
        // if no ids were returned, something is wrong. get out.
        if (ids.length == 0)
            System.exit(0);

        // begin output
        System.out.println("Current Time:");

        // create a Eastern Standard Time time zone
        SimpleTimeZone edt = new SimpleTimeZone(-5 * 60 * 60 * 1000, ids[0]);

        // set up rules for Daylight Saving Time
        edt.setStartRule(Calendar.MARCH,  8, -Calendar.SUNDAY, 2 * 60 * 60 * 1000);
        edt.setEndRule(Calendar.NOVEMBER, 1, -Calendar.SUNDAY, 2 * 60 * 60 * 1000);

        // create a GregorianCalendar with the Eastern Daylight time zone
        // and the current date and time
        Calendar calendar = new GregorianCalendar(edt);
        Date trialTime = new Date();
        calendar.setTime(trialTime);

        String s = String.format("Today: %1$tm/%1$te/%1$tY %1$tH.%1$tM.%1$tS", calendar);

        System.out.println(s);