package com.uas.report.util;

import java.util.Calendar;
import java.util.Date;

/**
 * 对时间的操作
 * 
 * @author sunyj
 * @since 2016年9月27日 下午8:10:50
 */
public class TimeUtils {
	/**
	 * Adds or subtracts the specified amount of time to the given calendar
	 * field, based on the calendar's rules. For example, to subtract 5 days
	 * from the specified time of the calendar, you can achieve it by calling:
	 * add(time, Calendar.DAY_OF_MONTH, -5).
	 * 
	 * @param time
	 * @param field
	 * @param amount
	 * @return
	 */
	public static Date add(Date time, int field, int amount) {
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(time);
		calendar.add(field, amount);
		return calendar.getTime();
	}
}