Date format issue using LocalDate

Question

I need to convert a Date object(it shows this in debug mode---> "Mon Sep 23 00:00:00 EDT 2019") to another Date object having "yyyy-MM-dd" format.

I tried the following code, but I get a runtime error saying:

java.time.format.DateTimeParseException: Text 'Mon Sep 23 00:00:00 EDT 2019' could not be parsed at index 0.

LocalDate localDate = LocalDate.parse(date.toString(), DateTimeFormatter.ofPattern("yyyy-MM-dd"));
Date result = Date.from(localDate.atStartOfDay(ZoneId.systemDefault()).toInstant());

Thanks for your help!.

What you see in the debugger is formatted by a custom formatter of your IDE. `toString()` has it's own format. However, you should use java conversion methods to change between date and localdate. — Menelaos, Feb 04 '20 at 22:49
You can’t. A `Date` hasn’t got, as in cannot have a format. See [this question](https://stackoverflow.com/questions/6262310/display-java-util-date-in-a-specific-format) or [my answer here](https://stackoverflow.com/a/52485250/5772882). Also what do you want an old-fashioned `Date` for when you can have a modern `LocalDate`? — Ole V.V., Feb 05 '20 at 06:31

Menelaos · Answer 1 · 2020-02-04T22:50:34.493

Your error

What you see in the debugger is formatted by a custom formatter of your IDE. Date.toString() has it's own format. However, you should use java conversion methods to change between date and localdate

Here is an except on date.toString():

The toString() method of Java Date class converts this date object into a String in form “dow mon dd hh:mm:ss zzz yyy”. This method overrides toString in class object.

Source

The pattern "yyyy-MM-dd" is not compatible with this.

Why are you doing this however? There are better ways to convert a Date into a LocalDate.

Convert Date to LocalDate (& Vice Versa)

Try the following:

public LocalDate convertToLocalDateViaInstant(Date dateToConvert) {
    return dateToConvert.toInstant()
      .atZone(ZoneId.systemDefault())
      .toLocalDate();
}

public Date convertToDateViaSqlDate(LocalDate dateToConvert) {
    return java.sql.Date.valueOf(dateToConvert);
}

Source

score -1 · Answer 2 · answered Feb 04 '20 at 22:43

-1

Date objects are Date, nothing else. String rapresentation of Date objects could have format. I think this

new SimpleDateFormat('yyyy-MM-dd').format(date);

is the only thing you need.

answered Feb 04 '20 at 22:43

Renato

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While it’s correct please don’t teach the young ones to use the long outdated and notoriously troublesome `SimpleDateFormat` class. At least not as the first option. And not without any reservation. Today we have so much better in [`java.time`, the modern Java date and time API,](https://docs.oracle.com/javase/tutorial/datetime/) and its `DateTimeFormatter`. – Ole V.V. Feb 05 '20 at 06:33

Date format issue using LocalDate

2 Answers2

Your error

Convert Date to LocalDate (& Vice Versa)