[@nativescript/datetimepicker] Bug in datetimepicker callback showing false date

Issue Summary:
The DateTimePicker in Android is exhibiting unexpected behavior when selecting a date in February. The callback is returning a date in the following month instead of the selected date.

Steps to Reproduce:

1. Open the app. https://stackblitz.com/edit/nativescript-stackblitz-templates-knotdp?file=src%2Fapp%2Fitem%2Fitems.component.ts
2. Click on the start date to open the DateTimePicker.
3. Select any date in February.

Expected Behavior:
The callback should return the selected date accurately.

Actual Behavior:
The callback returns a date in the next month instead of the selected date.

src/app/item/items.component.ts の StackBlitz 再現から始め、2月の日付で Android DateTimePicker の callback の問題を再現します。そのエントリーポイントから datetimepicker の callback を追跡し、callback が翌月ではなく選択された日付を返した場合に完了することを確認します。