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一個開始日期和結束日期之間的日期屬性我想編寫一個函數來得到Entry對象，它們的date場是beginPeriod和endPeriod我張貼下面的代碼片段與一個黑客的作品之間的列表。我必須從開始時間日期減去一天。看起來條件很好或平等不起作用。篩選與JDOQL
任何想法爲什麼我有這個問題？
public static List<Entry> getEntries(Date beginPeriod, Date endPeriod) {
/* TODO
* The great or equal condition does not seem to work in the filter below
* Substract a day and it seems to work
*/
Calendar calendar = Calendar.getInstance();
calendar.set(beginPeriod.getYear(), beginPeriod.getMonth(), beginPeriod.getDate() - 1);
beginPeriod = calendar.getTime();
PersistenceManager pm = JdoUtil.getPm();
Query q = pm.newQuery(Entry.class);
q.setFilter("this.date >= beginPeriodParam && this.date <= endPeriodParam");
q.declareParameters("java.util.Date beginPeriodParam, java.util.Date endPeriodParam");
List<Entry> entries = (List<Entry>) q.execute(beginPeriod,endPeriod);
return entries;
}