This kata is a subject to deduplication process here: https://github.com/codewars/content-issues/issues/192.
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sometimes "y" acts as a vowel, sometimes "y" acts as a consonant. When? This is a programming challenge, not a linguistics exams.

• No sample tests

• Random tests are not correct

Random Test, input: 22,4,1315 - Expected: [28, 'MAY', 1315], instead got: [28, 'APR', 1315]

Random Test, input: 13,12,2748 - Expected: [12, 'DEC', 2748], instead got: [11, 'DEC', 2748]
// We have 2748-12-31 -> 2748-DEC-29
// So 2748-12-13 -> 2748-DEC-11