Question

我在比较当前日期和从Database检索的日期时遇到了一些问题。我只是从DataBase中检索日期并存储在Date变量中，如下所示

String due_date_task = cursor.getString(cursor.getColumnIndex(dueDateOfTask));

SimpleDateFormat currentFormater = new SimpleDateFormat("dd/MM/yyyy");
Date date1 = currentFormater.parse(due_date_task);

现在，我想要的是检查从DataBase检索的日期是否等同于CurrentDate。

Calendar currentDate = Calendar.getInstance();
Date date2 = currentDate.getTime();

if(date1.equals(date2))

System.out.println（“今日任务”）;

我只想这样检查。谢谢提前

Answer 1

您可以使用此功能：

private boolean compareDates(Calendar objCal1, Calendar objCal2) {

  return ((objCal1.get(Calendar.YEAR) == objCal2.get(Calendar.YEAR))
    && (objCal1.get(Calendar.DAY_OF_YEAR) == objCal2.get(Calendar.DAY_OF_YEAR)));
}

创建日历对象：

Calendar objCal1 = new GregorianCalendar().setTime(date);
Calendar objCal2 = new GregorianCalendar().setTime(date1);

Answer 2

对于精确匹配（包括毫秒），请使用 getTime ：

if(date.getTime() == date1.getTime()){
   //do something
}

Answer 3

尝试这种方式获取当前日期，

Calendar calCurr = Calendar.getInstance();
Log.i("Time in mili of Current - Normal", ""+calCurr.getTimeInMillis()); // see what it gives? dont know why?
Date date = new Date();
calCurr.set(date.getYear()+1900, date.getMonth()+1, date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds());// so added one month to it
Log.i("Time in mili of Current - after update", ""+calCurr.getTimeInMillis()); // now get correct

现在为数据库值创建Calendar对象，

String due_date_task = cursor.getString(cursor.getColumnIndex(dueDateOfTask));      

SimpleDateFormat currentFormater = new SimpleDateFormat("dd/MM/yyyy");      
Date date = currentFormater.parse(due_date_task);     
Calendar start = Calendar.getInstance();
start.set(date.getYear(), date.getMonth(), date.getDate(), date.getHours(), date.getMinutes(), date.getSeconds());

现在比较两个日历对象

if(calCurr.equals(start))

android中的日期比较

3 个答案: