How to use

format

method

in

java.time.Year

@Override
public void serialize(Year year, JsonGenerator generator, SerializerProvider provider) throws IOException
{
  if (useTimestamp(provider)) {
    generator.writeNumber(year.getValue());
  } else {
    String str = (_formatter == null) ? year.toString() : year.format(_formatter);
    generator.writeString(str);
  }
}

@Override
public void serialize(Year year, JsonGenerator generator, SerializerProvider provider) throws IOException
{
  if (useTimestamp(provider)) {
    generator.writeNumber(year.getValue());
  } else {
    String str = (_formatter == null) ? year.toString() : year.format(_formatter);
    generator.writeString(str);
  }
}

@Override
public void serialize(Year year, JsonGenerator generator, SerializerProvider provider) throws IOException
{
  if (useTimestamp(provider)) {
    generator.writeNumber(year.getValue());
  } else {
    String str = (_formatter == null) ? year.toString() : year.format(_formatter);
    generator.writeString(str);
  }
}

  @Override
  public Object exec(List list) throws TemplateModelException {
    return getObject().format(createDateTimeFormatter(list, 0, "yyyy"));
  }
}

  private static String getFormatedDateString(String date, DateTimeFormatter formatter) {
    TemporalAccessor ta = formatter.parseBest(date,
      LocalDateTime::from, LocalDate::from, YearMonth::from, Year::from);
    if (ta instanceof LocalDateTime) {
      LocalDateTime ld = LocalDateTime.from(ta);
      return ld.format(DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss"));
    }
    if (ta instanceof LocalDate) {
      LocalDate ld = LocalDate.from(ta);
      return ld.format(DateTimeFormatter.ofPattern("yyyy-MM-dd"));
    }
    if (ta instanceof YearMonth) {
      YearMonth ld = YearMonth.from(ta);
      return ld.format(DateTimeFormatter.ofPattern("yyyy-MM"));
    }
    if (ta instanceof Year) {
      Year ld = Year.from(ta);
      return ld.format(DateTimeFormatter.ofPattern("yyyy"));
    }
    return date;
  }
}

@Override
public void serialize(Year year, JsonGenerator generator, SerializerProvider provider) throws IOException
{
  if (useTimestamp(provider)) {
    generator.writeNumber(year.getValue());
  } else {
    String str = (_formatter == null) ? year.toString() : year.format(_formatter);
    generator.writeString(str);
  }
}

@Override
public void serialize(Year year, JsonGenerator generator, SerializerProvider provider) throws IOException
{
  if (useTimestamp(provider)) {
    generator.writeNumber(year.getValue());
  } else {
    String str = (_formatter == null) ? year.toString() : year.format(_formatter);
    generator.writeString(str);
  }
}

@Override
public void serialize(Year year, JsonGenerator generator, SerializerProvider provider) throws IOException
{
  if (useTimestamp(provider)) {
    generator.writeNumber(year.getValue());
  } else {
    String str = (_formatter == null) ? year.toString() : year.format(_formatter);
    generator.writeString(str);
  }
}