最简单的方法是为此使用Joda Time Days类：
Date oldEventDate = ...Date newEventDate = ...Days days = Days.daysBetween(new DateTime(oldEventDate), new DateTime(newEventDate));int numberOfDays = p.getDays();
最简单的方法是为此使用Joda Time Days类：
Date oldEventDate = ...Date newEventDate = ...Days days = Days.daysBetween(new DateTime(oldEventDate), new DateTime(newEventDate));int numberOfDays = p.getDays();
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