java判断日期在今天 java判断日期是否是今天

public class TimeUtil {
	private TimeUtil() {
	}

	private static final long _1h = 3600000;

	public static boolean isToday(long time) {
		//Calendar使用单例，多次调用不重复创建对象
		Calendar calendar = Calendar.getInstance();
		//使用System获取当前时间
		calendar.setTimeInMillis(System.currentTimeMillis());
		calendar.set(Calendar.HOUR_OF_DAY, 0);
		calendar.set(Calendar.MINUTE, 0);
		calendar.set(Calendar.SECOND, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		long today = calendar.getTimeInMillis();
		if (time - today < _1h*24&&time-today>0)
			return true;
		return false;
	}

}