Repository: ionic-team/ionic-framework
File: core/src/components/datetime/datetime.tsx (TypeScript)

Code before:
        if (preferWheel) {
          /**
           * If the datetime is using a wheel picker, but the
           * active parts are empty, then the user has confirmed the
           * initial value (working parts) presented to them.
           */
          this.setValue(convertDataToISO(workingParts));
        } else {
          this.setValue(undefined);
        }
      } else {
        this.setValue(convertDataToISO(activeParts));
      }
    }

    if (closeOverlay) {
      this.closeParentOverlay(CONFIRM_ROLE);
    }
  }

  /**
   * Resets the internal state of the datetime but does not update the value.
   * Passing a valid ISO-8601 string will reset the state of the component to the provided date.
   * If no value is provided, the internal state will be reset to the clamped value of the min, max and today.
   * 
   * @param startDate a valid [ISO-8601 string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#date_time_string_format)
   */
  @Method()
  async reset(startDate?: string) {
    this.processValue(startDate);
  }

  /**
   * Emits the ionCancel event and
   * optionally closes the popover
   * or modal that the datetime was
   * presented in.
   * 
   * @param closeOverlay If `true`, closes the parent overlay. Defaults to `false`.
   */
  @Method()
  async cancel(closeOverlay = false) {
    this.ionCancel.emit();

    if (closeOverlay) {
      this.closeParentOverlay(CANCEL_ROLE);
    }
  }

  private warnIfIncorrectValueUsage = () => {
    const { multiple, value } = this;

Review comment (suggestion):
```suggestion
   * @param startDate a valid [ISO-8601 string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#date_time_string_format) to reset the datetime state to.
```

Code after:
        if (preferWheel) {
          /**
           * If the datetime is using a wheel picker, but the
           * active parts are empty, then the user has confirmed the
           * initial value (working parts) presented to them.
           */
          this.setValue(convertDataToISO(workingParts));
        } else {
          this.setValue(undefined);
        }
      } else {
        this.setValue(convertDataToISO(activeParts));
      }
    }

    if (closeOverlay) {
      this.closeParentOverlay(CONFIRM_ROLE);
    }
  }

  /**
   * Resets the internal state of the datetime but does not update the value.
   * Passing a valid ISO-8601 string will reset the state of the component to the provided date.
   * If no value is provided, the internal state will be reset to the clamped value of the min, max and today.
   *
   * @param startDate A valid [ISO-8601 string](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date#date_time_string_format) to reset the datetime state to.
   */
  @Method()
  async reset(startDate?: string) {
    this.processValue(startDate);
  }

  /**
   * Emits the ionCancel event and
   * optionally closes the popover
   * or modal that the datetime was
   * presented in.
   *
   * @param closeOverlay If `true`, closes the parent overlay. Defaults to `false`.
   */
  @Method()
  async cancel(closeOverlay = false) {
    this.ionCancel.emit();

    if (closeOverlay) {
      this.closeParentOverlay(CANCEL_ROLE);
    }
  }

  private warnIfIncorrectValueUsage = () => {
    const { multiple, value } = this;