假设 1 年等于 java 中的 360 天，如何将 n 天显示为日期？

Question

这是我的代码，

      int txtSubsDay = Integer.parseInt(this.textSubDay.getText());
      int txtDay = Integer.parseInt(this.textDay.getText());
      int txtMonth = Integer.parseInt(this.textMonth.getText());
      int txtYear = Integer.parseInt(this.textYear.getText());
      int daysToSubs = txtSubsDay;

      int convertedYears = (int)(daysToSubs / 360);
      int convertedMonths = (int)((daysToSubs % 360) / 30);
      int convertedDays = (int)((daysToSubs % 360) % 30);          

      Calendar calendar = new GregorianCalendar(txtYear, txtMonth-1, txtDay);
      calendar.add(Calendar.MONTH, -convertedMonths);
      calendar.add(Calendar.DAY_OF_MONTH, -convertedDays);
      calendar.add(Calendar.YEAR, -convertedYears);
      SimpleDateFormat dateFormat = new SimpleDateFormat("dd MM yyyy");
      SimpleDateFormat dayFormat = new SimpleDateFormat("d MMM yyyy");
      String lastDate = dateFormat.format(calendar.getTime());
      String lastDate2 = dayFormat.format(calendar.getTime());
      labelOutput.setText(lastDate);
      labelOutput2.setText(lastDate2);

这是我想要的。//////////////////////////////////// / 它节省了我的时间。

Answer 1

您需要计算两个日期之间的天数

//we have two dates, now and day 0 
Date d1 = new Date(0); 
Date d2 = new Date();
//substract times from each other, and divide this by number milisecond in day
int days =(int)((d2.getTime()-d1.getTime()) /(1000*60*60 *24) );

//and display your result
System.out.println(days+" days = "+(days/360)+" years "+((days%360)/30)+" month "+days%30);

Answer 2

int totalDays = 548;

int years = (int)(totalDays / 360);
int months = (int((totalDays % 360) / 30);
int days = (int)((totalDays % 360) % 30);

System.out.println("years: " + years + "; months: " + months + "; days: " + days);

// Result: years: 1; months: 6; days: 8

还是不太明白你为什么坚持用360年，用30几个月。如果您只想从一个日期中减去天数以获得过去的正确日期，请改用：

SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");

Date dateInstance = dateFormat.parse("27/07/2015");
int daysSubstracted = 548;

Calendar cal = Calendar.getInstance();
cal.setTime(dateInstance);
cal.add(Calendar.DATE, -daysSubstracted);
Date dateInPast = cal.getTime();

System.out.println(dateFormat.format(dateInPast));

// Result: 25/01/2014

假设 1 年等于 java 中的 360 天，如何将 n 天显示为日期？

how to display n day as date assuming 1 year equals 360 days in java?

java

function

calendar