Calendar计算日期

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一。周六三月进去。星期天

Calendar calendar=Calendar.getInstance();//当前日期
Calendar calendar2=Calendar.getInstance();
int curYear = calendar2.get(Calendar.YEAR); // 得到系统年份
int curMonth = calendar2.get(Calendar.MONTH); // 得到系统月份
int curDay=calendar2.get(Calendar.DAY_OF_MONTH);
Calendar nowyear=Calendar.getInstance();
nowyear.set(curYear,curMonth, curDay);//将開始日期设置为当天。如7月17日
Calendar nexty=Calendar.getInstance();
calendar2.add(Calendar.MONTH,4);
nexty.set(calendar2.get(Calendar.YEAR),calendar2.get(Calendar.MONTH), 1);//将结束时间设置为三个月后的第一天，如10月1日
calendar.add(Calendar.DAY_OF_MONTH, -calendar.get(Calendar.DAY_OF_WEEK));//周六 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
/**初始化周六的日期*/
calendar.add(Calendar.DAY_OF_MONTH, -calendar.get(Calendar.DAY_OF_WEEK));//周六
Calendar SaturdayC=(Calendar) calendar.clone(); for(;SaturdayC.before(nexty);SaturdayC.add(Calendar.DAY_OF_YEAR,7)){ if(SaturdayC.after(nowyear)){
Date date = sdf.parse(SaturdayC.get(Calendar.YEAR)+"-"+(1+SaturdayC.get(Calendar.MONTH))+"-"+SaturdayC.get(Calendar.DATE));
String time=sdf.format(date);
SaturdayList.add(time);
} }
/**初始化周日的日期*/
calendar.add(Calendar.DAY_OF_MONTH,-calendar.get(Calendar.DAY_OF_WEEK)+1);//周日
Calendar SundayC=(Calendar) calendar.clone();
for(;SundayC.before(nexty);SundayC.add(Calendar.DAY_OF_YEAR,7)){
if(SundayC.after(nowyear)){
Date date = sdf.parse(SundayC.get(Calendar.YEAR)+"-"+(1+SundayC.get(Calendar.MONTH))+"-"+SundayC.get(Calendar.DATE));
String time=sdf.format(date);
SundayList.add(time);
}
}

二，得到三个月内的工作日

/**
* 得到三个月末的最后一天
*/
Calendar cal = Calendar.getInstance();
// 不加以下2行。就是取当前时间前一个月的第一天及最后一天
cal.set(Calendar.YEAR,curYear);
cal.set(Calendar.MONTH,curMonth+2);
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.add(Calendar.DAY_OF_MONTH, -1);
Date lastDate = cal.getTime();String start =curYear+"-"+curMonth+"-"+curDay;
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date dBegin = null ;
try {
dBegin = sdf.parse(start);
} catch (ParseException e) {
e.printStackTrace();
}
WorkdayList.add(sdf.format(dBegin)); Calendar calBegin = Calendar.getInstance();
// 使用给定的 Date 设置此 Calendar 的时间
calBegin.setTime(dBegin);
Calendar calEnd = Calendar.getInstance();
// 使用给定的 Date 设置此 Calendar 的时间
calEnd.setTime(lastDate);
// 測试此日期是否在指定日期之后
while (lastDate.after(calBegin.getTime())){
// 依据日历的规则。为给定的日历字段加入或减去指定的时间量
calBegin.add(Calendar.DAY_OF_MONTH, 1);
WorkdayList.add(sdf.format(calBegin.getTime()));
} WorkdayList.removeAll(SaturdayList);
WorkdayList.removeAll(SundayList);