android - 将日历对象转换为日期 android 的问题

Question

我想按如下方式将日历对象转换为日期。

int year,month,day;
mCalendarEnd = Calendar.getInstance();
year = mCalendarEnd.get(Calendar.YEAR);
month = mCalendarEnd.get(Calendar.MONTH)+1;
day   = mCalendarEnd.get(Calendar.DAY_OF_MONTH);

现在将其转换为日期对象

Date d1 = new Date(day,month,year);

当我打印日期对象时:

System.out.println("Date : "+d1.getDay()+"/"+d1.getMonth()+"/"+d1.getYear());

它应该打印当前日期，但在上面的代码中它打印了错误的日期。知道如何解决这个问题吗？你所有的建议都是可观的。

Answer 1

你需要这样做

    //Set calendar
    Calendar calendar = Calendar.getInstance();
    Date date1 = calendar.getTime(); // gives a date object

    //To get day difference, Just an example
    calendar.add(Calendar.DAY_OF_MONTH, -7);
    Date date2 = calendar.getTime(); // gives a date object

    long differenceInMillis = Date1.getTime() - Date2.getTime();
    long differenceInDays = TimeUnit.DAYS.convert(differenceInMillis, TimeUnit.MILLISECONDS);

或者不需要日期对象

    Calendar calendar = Calendar.getInstance();
    long date1InMillis = calendar.getTimeInMillis();

    calendar.add(Calendar.DAY_OF_MONTH, -7);
    long date2InMillis = calendar.getTimeInMillis();

    long differenceInMillis = date1InMillis - date2InMillis;
    long differenceInDays = TimeUnit.DAYS.convert(differenceInMillis, TimeUnit.MILLISECONDS);
    calendar.getTimeInMillis()