Is it possible to turn java.util.Date() to int?

Question

I am developing an application where I have a JFormattedTextField with the current date in yyyy/mm/dd format and I want to move to int only these values. But the problem and what the eu am doing is returning more values

JFormattedTextField textId = new JFormattedTextField(new SimpleDateFormat("yyyy/MM/dd"));
textId.setValue(new java.util.Date());
textId.setBounds(20, 310, 100, 25);
Date data = (Date)textId.getValue();
long dataFinal = data.getTime();

How can I make the value of the Int only YYYY/MM/DD? With long, the variable dataFinal at the moment gives 1603883824076 is this the current time in nanoseconds?

Just format date using SimpleDateFormater as "yyyyMMdd" and parse this to int value. — MUNGAI NJOROGE, Oct 28 '20 at 11:27
Read this: https://docs.oracle.com/javase/8/docs/api/java/util/Date.html — Koenigsberg, Oct 28 '20 at 11:27
I'm fine with doing any reading at all, honestly. To find out *e.g.* about format being milliseconds. — Koenigsberg, Oct 28 '20 at 11:41
I recommend you don’t use `SimpleDateFormat` and `Date`. Those classes are poorly designed and long outdated, the former in particular notoriously troublesome. Instead use `LocalDate` and `DateTimeFormatter`, both from [java.time, the modern Java date and time API](https://docs.oracle.com/javase/tutorial/datetime/). — Ole V.V., Oct 29 '20 at 04:11

Ole V.V. · Answer 1 · 2020-10-29T04:22:25.850

Two suggestions:

Use java.time, the modern Java date and time API, for your date work.
If you need an int, use a count of days since the epoch day of January 1, 1970.

The two suggestions go nicely hand in hand since java.time offers a toEpochDay method for the conversion:

    Format localDateFormat = DateTimeFormatter.ofPattern("uuuu/MM/dd")
                                .toFormat(LocalDate::from);
    JFormattedTextField textId = new JFormattedTextField(localDateFormat);
    textId.setValue(LocalDate.now(ZoneId.systemDefault()));
    textId.setBounds(20, 310, 100, 25);
    LocalDate data = (LocalDate) textId.getValue();
    int dataFinal = Math.toIntExact(data.toEpochDay());

Today — October 29, 2020 — will give you 18564.

… with long the variable datefinal at the moment gives 1603883824076 is this the current time in nanoseconds? …

They are milliseconds since the epoch of January 1, 1970, 00:00 UTC. And as you have probably noticed, they don’t fit into an int.

Links

Oracle tutorial: Date Time explaining how to use java.time.
My answer to the question how to make a jtextfield having a fixed date format? giving more detail on using LocalDate with JFormattedTextField.

Very nice explanation! – Arvind Kumar Avinash Oct 29 '20 at 04:31 — Arvind Kumar Avinash, Oct 29 '20 at 04:31

score 0 · Accepted Answer · answered Oct 28 '20 at 11:50

Do you mean something like the following?

JFormattedTextField textId = new JFormattedTextField(new SimpleDateFormat("yyyy/MM/dd"));
textId.setValue(new java.util.Date());
textId.setBounds(20, 310, 100, 25);
String str = textId.getText().replaceAll("/", "");
int integer = Integer.parseInt(str);

The value of integer is 20201028 (because today's date is 2020/10/28, i.e. 28^th October 2020)

Is it possible to turn java.util.Date() to int?

2 Answers2