按指定的天数计算日期

Question

我使用Android Studio。我想计算自我指定日期起280天后的那一天。

Calendar thatDay = Calendar.getInstance(); //today date
thatDay.set(Calendar.DAY_OF_MONTH,selectedday);
thatDay.set(Calendar.MONTH,selectedmonth-1); // 0-11 so 1 less
thatDay.set(Calendar.YEAR, selectedyear);


Calendar afterday= Calendar.getInstance(); //280 after date
afterday.set(Calendar.DAY_OF_MONTH,selectedday+10);
afterday.set(Calendar.MONTH,selectedmonth+8); 
afterday.set(Calendar.YEAR, selectedyear);

Log.e(" After Day: ", " days:" +  (afterday.getTimeInMillis()- thatDay.getTimeInMillis())/ (24 * 60 * 60 * 1000));

日志输出变量。有时285,283,279种

Answer 1

只需func stringFromPossibleEnum(possibleEnum: Any) -> String? { if let e = possibleEnum as? StringRawRepresentable { return e.stringRawValue } return nil } stringFromPossibleEnum(possibleEnum: E2.two as Any)

Answer 2

#$0