When you look at the Hebrew root word for "Ahayah", you get H1961 "hayah" which means...
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Past ⬅️Was
Present ⬇️To exist/be
Future ➡️To come
Revelation 1:4
...Grace be unto you, and peace, from Him
Present⬇️ which is,
Past⬅️ and which was,
Future➡️ and which is to come...
Who IS and Who WAS and Who is COMING! The Most High's self-declared name reveals His unchanging, eternal nature. He's always present, thus Him being the Ancient of Days. He existed before time and will always exist.