MonthGetGenitiveNames Has 13 Items not 12

Why does System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.MonthGenitiveNames.ToArray
have 13 elements.

System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat.MonthGenitiveNames.Take(12).ToArray

Works, Still not sure why it has 13

“Some calendars, notably the Hebrew, can have 13 months. This tends to be in lunisolar calendars which use Lunar months, and then add an extra month every few years to avoid the start of the year changing too much from the solar year.”

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