Java 推算日期（计算距今多少年，多少月，多少天的日期）
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Result:
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Mon Oct 24 16:09:45 CST 2011?2011-10-24
Sun Oct 24 16:09:45 CST 2010?2010-10-24
Sat Sep 24 16:09:45 CST 2011?2011-09-24
Sun Oct 23 16:09:45 CST 2011?2011-10-23
Wed Oct 24 16:09:45 CST 2012?2012-10-24
Thu Nov 24 16:09:45 CST 2011?2011-11-24
Tue Oct 25 16:09:45 CST 2011?2011-10-25?
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