使用 DurationFormatUtils 计算时间间隔

// 当前时间
Date now = new Date();

// 2010上海世博会开幕时间
Date expo2010BeginDate = DateUtils.parseDate("2010-05-01 23:59:59", new String[] { "yyyy-MM-dd HH:mm:ss" });

// 2010上海世博会闭幕时间
Date expo2010EndDate = DateUtils.parseDate("2010-10-31 23:59:59", new String[] { "yyyy-MM-dd HH:mm:ss" });

System.out.println(DurationFormatUtils.formatDuration(expo2010BeginDate.getTime() - now.getTime(), "d"));

System.out.println(DurationFormatUtils.formatDuration(expo2010BeginDate.getTime() - expo2010EndDate.getTime(),
"d"));

Duration formatting utilities and constants. The following table describes the tokens used in the pattern language for formatting.

以下是format参数

character	duration element
y	years
M	months
d	days
H	hours
m	minutes
s	seconds
S	milliseconds

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原文链接：
http://blog.csdn.net/kimsoft/article/details/5106984