lol

GarbageFreeClock.java

package com.vizor.unreal.util.util;

import java.time.ZonedDateTime;

public class GarbageFreeClock
{
    private static final int msInSec = 1000;
    private static final int msInMin = msInSec * 60;
    private static final int msInHou = msInMin * 60;
    private static final int msInDay = msInHou * 24;

    private static final String pattern = "HH:MM:SS:ZZZ";
    private static final char ZERO_CHAR = '0';

    private static final int msZoneOffset = ZonedDateTime.now().getOffset().getTotalSeconds() * msInSec;

    private static String concatenateArray(final int h, final int m, final int s, final int z)
    {
        int i = 0;
        final char[] buf = new char[pattern.length()];

        // hour
        i = shiftedNumber(h, buf, i);
        buf[i++] = ':';

        // min
        i = shiftedNumber(m, buf, i);
        buf[i++] = ':';

        // sec
        i = shiftedNumber(s, buf, i);
        buf[i++] = ':';

        // ms
        if (z < 100)
        {
            buf[i++] = ZERO_CHAR;
            shiftedNumber(z, buf, i);
        }
        else
        {
            buf[i++] = (char)(ZERO_CHAR + (z / 100));
            shiftedNumber(z % 100, buf, i);
        }

        return new String(buf);
    }

    private static int shiftedNumber(final int time, char[] buf, int i)
    {
        if (time < 10)
        {
            buf[i++] = ZERO_CHAR;
            buf[i++] = (char) (ZERO_CHAR + time);
        }
        else
        {
            buf[i++] = (char) (ZERO_CHAR + (time / 10));
            buf[i++] = (char) (ZERO_CHAR + (time % 10));
        }
        return i;
    }

    public static String currentTimeUTC()
    {
        return currentTime(false);
    }

    public static String currentTime(boolean locallyShifted)
    {
        final long currentTimeMillis = System.currentTimeMillis();

        // Always can fit in int, because it is lesser than msInDay
        int z;
        if (locallyShifted)
            z = (int)((currentTimeMillis + msZoneOffset) % msInDay);
        else
            z = (int)(currentTimeMillis % msInDay);

        // Disintegrate into parts
        final int h = z / msInHou;
        z -= (h * msInHou);

        final int m = z / msInMin;
        z -= (m * msInMin);

        final int s = z / msInSec;
        z -= (s * msInSec);

        return concatenateArray(h, m, s, z);
    }
}