Use GMT date when fetching cancellation orders.

[vedanshujain]

Submission Review Guidelines:

• I have followed the WooCommerce Contributing Guidelines and the WordPress Coding Standards.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have reviewed my code for security best practices.
• Following the above guidelines will result in quick merges and clear and detailed feedback when appropriate.

Changes proposed in this Pull Request:

In get_unpaid_orders the passed $date parameter is a timezone-based timestamp, but we used it as a UTC-based timestamp. This caused issues as the function will return unpaid orders not yet eligible for cancellation and would cancel it, in timezones that are ahead of UTC (countries towards the east of the GMT line).

This is fixed by converting the timestamp to UTC before comparing it with the order-modified timestamps.

Closes #43593

How to test the changes in this Pull Request:

Using the WooCommerce Testing Instructions Guide, include your detailed testing instructions:

1. Set HPOS to authoritative, set the hold stock setting to 60 min in WooCommerce > Settings > Products > Inventory
2. Set the WordPress site time zone to any timezone greater than +1 UTC, such as IST (which is +5:30)
3. Check out an order with any product via checkout flow.
4. Open the new order in wc-admin, and set the order status to pending payment.
5. Using the CLI, manually run the cron job for cancelling unpaid order like so: wp eval "wc_cancel_unpaid_orders();"
6. Refresh the order admin page for the new order. Check that it's not cancelled.

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Significance

• Patch
• Minor
• Major

Type

• Fix - Fixes an existing bug
• Add - Adds functionality
• Update - Update existing functionality
• Dev - Development related task
• Tweak - A minor adjustment to the codebase
• Performance - Address performance issues
• Enhancement - Improvement to existing functionality

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[github-actions]

Test Results Summary

Commit SHA: bd2c611

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 38s
E2E Tests	258	0	0	21	0	279	3m 49s

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[github-actions]

Hi @lsinger, @Konamiman,

Apart from reviewing the code changes, please make sure to review the testing instructions as well.

You can follow this guide to find out what good testing instructions should look like:
https://github.com/woocommerce/woocommerce/wiki/Writing-high-quality-testing-instructions