solution

[KateBerd]

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[mateacademy-ai-mentor]

Review Summary

Your implementation passes all requirements and correctly handles the year conversion, separator changes, and date part reordering as specified. While the file comment notes that using year < 100 for year detection is unconventional (since it relies on string-to-number coercion rather than explicitly checking year.length === 2), this is a code style preference rather than a functional issue. Your code works correctly for both 2-digit years like '02' (which coerces to 2 < 100 → converts to '2002') and 4-digit years like '2002' (which coerces to 2002 >= 100 → returns as-is). The century logic for YY→YYYY conversion is properly implemented with 20 prefix for 00-29 and 19 for 30-99. No changes are required.

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[mateacademy-ai-mentor]

The condition year < 100 works by accident for 4-digit years like '2002' (since 2002 is not < 100), but the logic is conceptually flawed. It should check year.length === 2 to determine if conversion is needed, rather than relying on numeric comparison that coincidentally works for some values.