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import java.text.SimpleDateFormat; import java.util.Calendar; public class DateHelper { /** * 当前月第一天 * @return */ public static String getFirstDayOfMonth(){ SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd 00:00:00"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1 号 lastDate.add(Calendar.MONTH,-1);//加一个月,变为下月的1 号 return sdf.format(lastDate.getTime()); } /** * 计算当月最后一天 * @return */ public static String getLastDayOfMonth(){ SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd 23:59:59"); Calendar lastDate = Calendar.getInstance(); lastDate.set(Calendar.DATE,1);//设为当前月的1 号 lastDate.add(Calendar.DATE,-1);//减去一天,变为当月最后一天 return sdf.format(lastDate.getTime()); } /** * 获取年月 * @return */ public static String getThisYearAndMonth(){ SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM"); return sdf.format(getFirstDayOfMonth()); } }