The Book of Ezekiel begins “in the thirtieth year.”
Now it came to pass in the thirtieth year, in the fourth month, in the fifth day of the month, as I was among the captives by the river Chebar that the heavens were opened, and I saw visions of God.
וַיְהִי בִּשְׁלֹשִׁים שָׁנָה, בָּרְבִיעִי בַּחֲמִשָּׁה לַחֹדֶשׁ,
וַאֲנִי בְתוֹךְ-הַגּוֹלָה, עַל-נְהַר-כְּבָר; נִפְתְּחוּ, הַשָּׁמַיִם, וָאֶרְאֶה, מַרְאוֹת אֱלֹהִים.
— Ezekiel, 1:1
— (“old”) JPS trans. (1917), borrowed from Mechon-Mamre
"A Song Every Day" 