Question

我想计算今天的日期和数据库的日期之间的差异。我写了一个方法，但它不能完全发挥作用。我应该如何描绘两个日期之间的天数差异？

   public ArrayList<String> roznicadni(){
    ArrayList<String> roznicadni = new ArrayList<String>();
    SQLiteDatabase db = DbHelper.getReadableDatabase();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    final String date = sdf.format(new Date());
    String zapytanie = "SELECT "+date+" - "+Zlecenia_stale.Kolumny.datatstale+" AS xxx FROM "+Zlecenia_stale.NAZWA_TABELI+" WHERE id_portfela = "+WyborPortfela.portfel_id;
    Cursor kursor = db.rawQuery(zapytanie, null);
    for (kursor.moveToFirst(); !kursor.isAfterLast(); kursor.moveToNext()) {
        roznicadni.add(1,kursor.getString(kursor.getColumnIndex("xxx")));
    }
    return roznicadni;
}

Answer 1

使用TimeUnit

long dif  = currentDate.getTime() - dbDate.getTime();

long diffInSeconds = TimeUnit.MILLISECONDS.toSeconds(dif);
long diffInMinutes = TimeUnit.MILLISECONDS.toMinutes(dif);
long diffInHours = TimeUnit.MILLISECONDS.toHours(dif);

Answer 2

试试这个：

String database_date = "2016-01-08 12:56:50";
SimpleDateFormat dateFormat = new SimpleDateFormat(
        "yyyy-MM-dd HH:mm:ss");

try {

    Date oldDate = dateFormat.parse(database_date);
    System.out.println(oldDate);

    Date currentDate = new Date();

    //difference in days,hours,minutes etc..
    long diff = currentDate.getTime() - oldDate.getTime();
    long seconds = diff / 1000;
    long minutes = seconds / 60;
    long hours = minutes / 60;
    long days = hours / 24;

    if (oldDate.before(currentDate)) {

        Log.e("oldDate", "is previous date");
        Log.e("Difference: ", " seconds: " + seconds + " minutes: " + minutes
                + " hours: " + hours + " days: " + days);

    }


} catch (ParseException e) {

    e.printStackTrace();
}

今天的数据库日期和日期之间的差异

2 个答案: