* Persist and expose Umbraco system dates as UTC (#19705)
* Updated persistence DTOs defining default dates to use UTC.
* Remove ForceToUtc = false from all persistence DTO attributes (default when not specified is true).
* Removed use of SpecifyKind setting dates to local.
* Removed unnecessary Utc suffixes on properties.
* Persist current date time with UtcNow.
* Removed further necessary Utc suffixes and fixed failing unit tests.
* Added migration for SQL server to update database date default constraints.
* Added comment justifying not providing a migration for SQLite default date constraints.
* Ensure UTC for datetimes created from persistence DTOs.
* Ensure UTC when creating dates for published content rendering in Razor and outputting in delivery API.
* Fixed migration SQL syntax.
* Introduced AuditItemFactory for creating entries for the backoffice document history, so we can control the UTC setting on the retrieved persisted dates.
* Ensured UTC dates are retrieved for document versions.
* Ensured UTC is returned for backoffice display of last edited and published for variant content.
* Fixed SQLite syntax for default current datetime.
* Apply suggestions from code review
Co-authored-by: Laura Neto <12862535+lauraneto@users.noreply.github.com>
* Further updates from code review.
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Co-authored-by: Laura Neto <12862535+lauraneto@users.noreply.github.com>
* Migrate system dates from local server time to UTC (#19798)
* Add settings for the migration.
* Add migration and implement for SQL server.
* Implement for SQLite.
* Fixes from testing with SQL Server.
* Fixes from testing with SQLite.
* Code tidy.
* Cleaned up usings.
* Removed audit log date from conversion.
* Removed webhook log date from conversion.
* Updated update date initialization on saving dictionary items.
* Updated filter on log queries.
* Use timezone ID instead of system name to work cross-culture.
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Co-authored-by: Laura Neto <12862535+lauraneto@users.noreply.github.com>
