Fix DateOnly: check target runtime version instead of design-time host#323

sergey-tihon merged 2 commits intorepo-assist/fix-format-date-dateonly-2026-03-12-76e70b2ca366aa05fsprojects/SwaggerProvider:repo-assist/fix-format-date-dateonly-2026-03-12-76e70b2ca366aa05from

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