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When did Athens adopt the Ionic alphabet?

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Thematic map of Eurasia showing the approximate geographic distribution of Indo-European language families, each represented by a different color. Areas include Celtic in western Europe, Germanic in northern and central Europe, Romance in southwestern Europe, Slavic in eastern Europe and Russia, and Indo-Iranian languages in South Asia. Non-Indo-European language regions and areas of common bilingualism are also indicated. — Greek language Approximate locations of Indo-European languages in contemporary Eurasia.

Athens officially adopted the Ionic alphabet in 403 BCE. This system, which originated in the Anatolian city of Miletus, was accepted as the standard 24-letter Greek alphabet by the middle of the 4th century BCE.12