CODEWITHSUNDEEP
javadatelocaldate
Georgios
Georgios

Reputation: 1037

Special string to LocalDate

From the following String I want to get the LocalDate or LocalDateTime.

Jan 1, 2019 12:00:00 AM

I have already tried the following code but I am getting the following error:

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM d, yyyy hh:mm:ss a"); // also with dd
formatter = formatter.withLocale(Locale.GERMAN);
LocalDateTime localDateTime = LocalDateTime.parse(stringDate, formatter);
LocalDate localDate = LocalDate.parse(stringDate, formatter);

The way I would like to have the date, in the end, would be like

Is this even possible? Would be instead the use of regular expressions an overkill?

Upvotes: 1

Views: 1201

Answers (2)

Thomas Pötzsch
Thomas Pötzsch

Reputation: 329

There are a few problems with your code, but I will propose a working solution here:

  1. HH is the hour of the day, not the hour 0-12 (which is hh)
  2. you should use a DateTimeFormatterBuilder
  3. you should use the proper locale, probably GERMANY instead of GERMAN
  4. the name of the month is represented as L, not as M
  5. the german locale uses vorm. and nachm. instead of AM and PM -> a quick solution is to replace the terms

Putting it all together leaves us with this:

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.util.Locale;

class Scratch {

    public static void main(String[] args) {
        String stringDate = "Jan 1, 2019 11:00:00 PM";
        stringDate = stringDate.replace("AM", "vorm.");
        stringDate = stringDate.replace("PM", "nachm.");
        DateTimeFormatter formatter = new DateTimeFormatterBuilder()
                .appendPattern("LLL d, yyyy hh:mm:ss a")
                .toFormatter(Locale.GERMANY);
        LocalDateTime localDateTime = LocalDateTime.parse(stringDate, formatter);
        LocalDate localDate = LocalDate.parse(stringDate, formatter);
    }

}

If anybody has a different approach to handling the AM/vorm.-dilemma, I would be glad to see it!

Upvotes: 3

ejdebruin
ejdebruin

Reputation: 51

You're getting the error because you're trying to parse a LocalDateTime format into a LocalDate.

If you have the full LocalDateTime, you shouldn't need a separate LocalDate. If there is a need, there's also a toLocalDate() method within LocalDateTime.

    String stringDate = "Jan 1, 2019 12:00:00 AM";
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMM d, yyyy hh:mm:ss a"); // also with dd
    formatter = formatter.withLocale(Locale.GERMAN);
    LocalDateTime localDateTime = LocalDateTime.parse(stringDate, formatter);

    DateTimeFormatter firstOutputFormat = DateTimeFormatter.ofPattern("MM.DD.YY.");
    String outputFirst = localDateTime.format(firstOutputFormat).concat(" LocalDate");

    DateTimeFormatter secondOutputFormat = DateTimeFormatter.ofPattern("MM.DD.YY. HH.mm");
    String outputSecond = localDateTime.format(secondOutputFormat).concat(" LocalDateTime (24h)");

Upvotes: 1

Related Questions