How to globally configure `@DateTimeFormat` pattern in Spring Boot?

Question

Im my Spring Boot application, I have some controllers that accept a date as query parameter:

@RestController
public class MyController {

  @GetMapping
  public         


        

Answer 1

This is currently not easily possible (e.g. by setting a simple configuration property), see #5523. The best solution I found so far is to register a Formatter. This will also work with optional parameters modeled as Optional:

  @Bean
  public Formatter localDateFormatter() {
    return new Formatter() {
      @Override
      public LocalDate parse(String text, Locale locale) throws ParseException {
        return LocalDate.parse(text, DateTimeFormatter.ISO_DATE);
      }

      @Override
      public String print(LocalDate object, Locale locale) {
        return DateTimeFormatter.ISO_DATE.format(object);
      }
    };
  }

It may become possible to set this using a configuration property when my proposal in #9930 has been merged.