code: public void setModifiedOn(LocalDateTime modifiedOn) {
      processChange("modifiedOn", this.modifiedOn, modifiedOn);
      this.lastModifiedOn = ObjectUtils.defaultIfNull(this.lastModifiedOn, this.modifiedOn);
    }
docs: Sets the date and time when this object was modified.
  
  @param modifiedOn a Calendar object denoting the date and time when this object was modified.
  @see org.cp.elements.lang.Auditable