code: @NotNull
    public Candidate setDateOfBirth(@Nullable final Date dateOfBirth) {
      if (dateOfBirth == null) {
        this.dateOfBirth = null;
        return this;
      }
  
      this.dateOfBirth = new Date(dateOfBirth.getTime());
      return this;
    }
docs: Set the date of birth of your candidate.
  
  @param dateOfBirth  the date of birth
  @return this