Remove timestap from current date when saving product special price from date

[JeroenVanLeusden]

Description (*)

Full timestamp is saved when creating a new product with a special price but without a special price from value.

With this fix, the time is reset so only the date will be saved. This is also in line with the UI where only a date can be selected.

Fixed Issues (if relevant)

1. None I could find.

Manual testing scenarios (*)

1. Set configuration on global scope general/locale/timezone > Europe/Amsterdam.
2. Set configuration on en_US scope general/locale/timezone > America/New_York.
3. Create new simple product with special price (leave special price from date empty).
4. Product will be saved with a current timestamp using the Europe/Amsterdam timezone.
5. Navigate to product on frontend (en_US store), no special price is shown. This is because special price from date is checked against the America/New_York timezone. This isn't the case for another five hours.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @JeroenVanLeusden. Thank you for your contribution
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[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-4599 has been created to process this Pull Request

[soleksii]

✔️ QA Passed

[m2-assistant]

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