Question

I have a Field in Mongo DB called as updated_at

Which will look in DB this way

updated_at : NumberLong(“1355754242785”)

This Updated_at filed is created in Database this way

long now = System.currentTimeMillis();

From one of the DB Record , i have taken a value as

updated_at" : NumberLong("1355754242785"), "volatility12" : "na", "vwap" : "0", "wk52hi" : "0", "wk52hidate" : "----"}

For example say its value is 1355754242785

Is it possible to convert the 1355754242785 , when this was Updated ??

When i tried converting

public class Aim {
    public static void main(String[] args) {
        DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss.SSS");
        long now = 1355754242785; // Error here saying out of range 
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(now);
        System.out.println(now + " = " + formatter.format(calendar.getTime()));
    }
}

Answer 1

Change

  long now = 1355754242785; // Error here saying out of range 

to

long now = 1355754242785L; 

This is a compilation error, for the assignment; that should give you a clue that the problem has nothing to do with dates, just with the fact that a literal number in Java is assumed to be an int, which have a maximum value of 2^31-1 . You must add the L suffix to tell Java that the literal is to be interpreted as a long.