Motivation / Background

This Pull Request has been created to fix #51679, a bug that appears when working with time field and timezones.

Basically, the bug occurs when ActiveRecord deserialized time field's day in other day but not the default one (01-01-2000), and it impacts validations and comparisons.

More details from the bug in the issue #51679.

Detail

This Pull Request changes the deserialized method TimeZoneConverter to always set the day for (01-01-2000) when we are working with the default time field.

Additional information

For alternative solutions, we have some options thanks to mkbehbehani #51679 (comment)

• Using the ToD :time_only ActiveRecord attribute for Time of Day representation in application logic
• In Postgres, using the time column type.
• Timezone config for both Rails and Postgres set to UTC and performing changes into desired local timezone before read/write/comparison using .in_time_zone(location_timezone).

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Unrelated changes should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.