java 時間處理 獲取周的第一天 最後一天,月的第一天和最後一天: java
Calendar calendar=Calendar.getInstance(); calendar.setTime(new Date()); //設置當前時間 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); SimpleDateFormat sdfall=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //獲取天開始時間和結束時間 startDate=sdf.parse(sdf.format(calendar.getTime())); endDate=sdfall.parse(sdf.format(calendar.getTime())+" 23:59:59"); //獲取當前周的一天後最後一天 calendar.setFirstDayOfWeek(Calendar.MONDAY); calendar.set(Calendar.DAY_OF_WEEK,calendar.getFirstDayOfWeek()); startDate=sdf.parse(sdf.format(calendar.getTime())); calendar.set(Calendar.DAY_OF_WEEK,calendar.getFirstDayOfWeek()+6); endDate=sdfall.parse(sdf.format(calendar.getTime())+" 23:59:59"); //獲取當前月的第一天和最後一天 calendar.set(calendar.get(Calendar.YEAR),calendar.get(Calendar.MONTH), 1); startDate=sdf.parse(sdf.format(calendar.getTime())); calendar.roll(Calendar.DATE, -1); endDate=sdfall.parse(sdf.format(calendar.getTime())+" 23:59:59");