Calendar instance = Calendar.getInstance(); instance.clear(); instance.setTime(new Date()); instance.set(Calendar.HOUR_OF_DAY,23); instance.set(Calendar.MINUTE,59); instance.set(Calendar.SECOND,59); Date etime = instance.getTime(); instance.set(Calendar.HOUR_OF_DAY,0); instance.set(Calendar.MINUTE,0); instance.set(Calendar.SECOND,0); Date stime = instance.getTime(); String dateToStr = DateUtils.dateToStr(stime, "yyyy-MM-dd"); String dateToStr2 = DateUtils.dateToStr(etime, "yyyy-MM-dd");