java判斷兩個時間是不是同一天的方法

代碼如下：

public class TimeUtil {

    public static final int SECONDS_IN_DAY = 60 * 60 * 24;
    public static final long MILLIS_IN_DAY = 1000L * SECONDS_IN_DAY;

    public static boolean isSameDayOfMillis(final long ms1, final long ms2) {
        final long interval = ms1 - ms2;
        return interval < MILLIS_IN_DAY
                && interval > -1L * MILLIS_IN_DAY
                && toDay(ms1) == toDay(ms2);
    }
    private static long toDay(long millis) {
        return (millis + TimeZone.getDefault().getOffset(millis)) / MILLIS_IN_DAY;
    }
}