java设置时间偏移天数，

1，

1package com.banksteel.openerp.common.vo;
2
3import java.io.Serializable;
4
5public class TimeIntervalVO implements Serializable {
6
7	/**
8	 * 
9	 */
10	private static final long serialVersionUID = -1568237892596588268L;
11	private Long beginInMillis; // 设置时间当天的零点
12	private Long endInMillis;  // 设置时间当天最后一秒
13	private String beginInString; // 显示时间
14	private String endInString; // 显示时间
15
16	public Long getBeginInMillis() {
17		return beginInMillis;
18	}
19
20	public void setBeginInMillis(Long beginInMillis) {
21		this.beginInMillis = beginInMillis;
22	}
23
24	public Long getEndInMillis() {
25		return endInMillis;
26	}
27
28	public void setEndInMillis(Long endInMillis) {
29		this.endInMillis = endInMillis;
30	}
31
32	public String getBeginInString() {
33		return beginInString;
34	}
35
36	public void setBeginInString(String beginInString) {
37		this.beginInString = beginInString;
38	}
39
40	public String getEndInString() {
41		return endInString;
42	}
43
44	public void setEndInString(String endInString) {
45		this.endInString = endInString;
46	}
47
48	@Override
49	public String toString() {
50		return "TimeIntervalVO [beginInMillis=" + beginInMillis + ", endInMillis=" + endInMillis + ", beginInString="
51				+ beginInString + ", endInString=" + endInString + "]";
52	}
53
54}

　　2.

1/*jadclipse*/// Decompiled by Jad v1.5.8g. Copyright 2001 Pavel Kouznetsov.
2
3package cn.mysteel.util;
4
5import java.text.SimpleDateFormat;
6import java.util.Date;
7import org.apache.commons.lang.StringUtils;
8
9public class DateUtils
10{
11
12    public DateUtils()
13    {
14    }
15
16    public static Date getDate(String s)
17    {
18        return getDate(s, null);
19    }
20
21    public static Date getJustDate(String s)
22    {
23        return getDate(s, "yyyy-MM-dd");
24    }
25
26    public static Date getDate(long date)
27    {
28        return getDate(date, null);
29    }
30
31    public static Date getJustDate(long date)
32    {
33        return getDate(date, "yyyy-MM-dd");
34    }
35
36    public static Date getDate(long date, String format)
37    {
38        if(StringUtils.isEmpty(format))
39            format = "yyyy-MM-dd HH:mm:ss";
40        return getDate(formatDate(new Date(date), format), format);
41    }
42
43    public static Date getDate(String s, String format)
44    {
45        Date date;
46        try
47        {
48            if(StringUtils.isEmpty(format))
49                format = "yyyy-MM-dd HH:mm:ss";
50            date = (new SimpleDateFormat(format)).parse(s);
51        }
52        catch(Exception e)
53        {
54            date = new Date(0L);
55        }
56        return date;
57    }
58
59    public static String formatDate(long date, String format)
60    {
61        return formatDate(new Date(date), format);
62    }
63
64    public static String formatDate(long date)
65    {
66        return formatDate(new Date(date), null);
67    }
68
69    public static String formatJustDate(long date)
70    {
71        return formatDate(new Date(date), "yyyy-MM-dd");
72    }
73
74    public static String formatDate(Date date, String format)
75    {
76        if(StringUtils.isEmpty(format))
77            format = "yyyy-MM-dd HH:mm:ss";
78        return (new SimpleDateFormat(format)).format(date);
79    }
80
81    public static final String DATE_FROMAT1 = "yyyy-MM-dd";
82    public static final String DATE_FROMAT2 = "yyyy-MM-dd HH:mm:ss";
83}
84
85
86/*
87	DECOMPILATION REPORT
88
89	Decompiled from: D:\eclipse\demo-maven\repository\cn\mysteel\shgl-core\1.0.0-SNAPSHOT\shgl-core-1.0.0-SNAPSHOT.jar
90	Total time: 321 ms
91	Jad reported messages/errors:
92	Exit status: 0
93	Caught exceptions:
94*/

　　3

1package com.banksteel.openerp.utils;
2
3import java.util.Calendar;
4
5import com.banksteel.openerp.common.vo.TimeIntervalVO;
6
7import cn.mysteel.util.DateUtils;
8
9/**
10 * 时间工具类
11 * 
12 * @description:
13 * @projectName:openerp-webapp
14 * @className:TimeUtils.java
15 * @createTime:2016年9月27日 下午4:02:40
16 * @version 1.0
17 */
18public class TimeUtils {
19
20	private TimeUtils() {
21	};
22
23	/**
24	 * 获取基准时间戳计算指定天数后的当天00:00:00.000至23:59:59.999时间戳区间
25	 * 
26	 * @param millis
27	 *            基准时间戳
28	 * @param dayOffset
29	 *            偏移天数，0表示当天，正数表示基准时间戳之后N天，负数反之
30	 * @createTime:2016年9月29日 下午5:19:40
31	 */
32	public static TimeIntervalVO getMillisInterval(Long millis, int dayOffset) {
33		TimeIntervalVO interval = new TimeIntervalVO();
34		Calendar calendar = Calendar.getInstance();
35		if (millis > 0) {
36			calendar.setTime(DateUtils.getDate(millis, "yyyy-MM-dd"));
37			calendar.add(Calendar.DATE, dayOffset);
38			interval.setBeginInMillis(calendar.getTimeInMillis());
39			interval.setBeginInString(DateUtils.formatDate(calendar.getTimeInMillis(), "yyyy-MM-dd HH:mm:ss.SSS"));
40			interval.setEndInMillis(calendar.getTimeInMillis() + 86400000L - 1L);
41			interval.setEndInString(
42					DateUtils.formatDate(calendar.getTimeInMillis() + 86400000L - 1L, "yyyy-MM-dd HH:mm:ss.SSS"));
43		}
44		return interval;
45	}
46
47}

　　4，java调用

1public static void main(String[] args)
2	{
3		//当前时间
4		Long currentTimeMillis = System.currentTimeMillis();
5		// 30天前时间
6		TimeIntervalVO beginTime = null;
7		beginTime = TimeUtils.getMillisInterval(currentTimeMillis, -30);
8		// 昨天时间
9		TimeIntervalVO endTime = null;
10		endTime = TimeUtils.getMillisInterval(currentTimeMillis, -1);
11		System.out.println(beginTime.toString());
12		System.out.println(endTime.toString());
13		
14	}

显示结果