SQL消耗日期与前一天

Question

So I'm writing some REST API and one of my entity has a java.util.Date type; My POST endpoint consumes JSON type, something like this:

{
   "authorId": 7845,
   "authorName": {
      "first": "Dan",
      "second": "Brown"
   },
   "birth": {
      "date": "1987-10-25",
      "country": "USA",
      "city": "New York"
   },
   "description": "Very good author!"
}

Also I override jackson deserialize method to handle invalid date format and everything that involves this:

public class CustomDateDeserializer extends StdDeserializer<Date> {
    public CustomDateDeserializer() {
        this(null);
    }

    public CustomDateDeserializer(Class t) {
        super(t);
    }

    @Override
    public Date deserialize(JsonParser jp, DeserializationContext dc) throws IOException {
        String date = jp.getValueAsString();

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        sdf.setLenient(false);

        Date parsed;
        try {
            parsed = sdf.parse(date);
        } catch (ParseException e) {
            throw new InvalidDateTypeException(jp.currentName(), jp.getText());
        }
        return parsed;
    }
}

In my DTO model I use exactly this deserializer for this parameter:

@JsonFormat(pattern = "yyyy-MM-dd")
@JsonDeserialize(using = CustomDateDeserializer.class)
@PastOrPresent(message = "Value 'date' must be past or present!")
private Date date;

During life of all my intermediate objects (models and DTOs) this value everywhere looks like in input JSON - 1987-10-25 .

Controller:

@PostMapping(value = "/author/new", consumes = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<?> addNewAuthor(@RequestBody @Valid AuthorPostDto postAuthor) {
    AuthorPostDto response = authorService.addNewAuthor(postAuthor);
    return new ResponseEntity<>(response, HttpStatus.CREATED);
}

Service method:

public AuthorPostDto addNewAuthor(AuthorPostDto author) {
    if (authorRepository.existsByAuthorId(author.getAuthorId())) {
        throw new AuthorAlreadyExistsException();
    }

    Author toPost = toModelMapper.mapAuthorDtoToAuthor(author);
    Author response = authorRepository.save(toPost);
    return toDtoMapper.mapAuthorModelToDto_POST(response);
}

All objects - postAuthor (parsed by Jackson in Controller), toPost , response and returned value from service - contains Date value like in input JSON - 1987-10-25 .

But in SQL and in returned value from controller date appear with the day before: 1987-10-24 ...

How to fix this??

Answer 1

Oh... After day of fighting with this I won!

Problem was in next: when I post my json with date 1987-10-25 it parsed to my DTO as it needed. But date must also has hours, munites and seconds. So, that's why Java automatically set here six zeros: 00:00:00 . So, my Date look like this: 1987-10-25 00:00:00 .

As I wrote during life of all my intermediate objects (models and DTOs) this value everywhere looks like this date: 1987-10-25 00:00:00 . But as soon as this object leave my application it set here my time zone: -2. So, to SQL and in response JSON my date be like this: 1987-10-24 22:00:00 .

To solve it - set timezone to 0 in deserialize method:

public Date deserialize(JsonParser jp, DeserializationContext dc) throws IOException {
    String date = jp.getValueAsString();

    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    sdf.setTimeZone(TimeZone.getTimeZone(ZoneOffset.ofHours(0))); //here
    sdf.setLenient(false);

    Date parsed;

    try {
        parsed = sdf.parse(date);
    } catch (ParseException e) {
        throw new InvalidDateTypeException(jp.currentName(), jp.getText());
    }

    return parsed;
}

Now it works good for me.