בִּשְׁנַ֣ת שָׁל֗וֹשׁ לְכ֙וֹרֶשׁ֙ מֶ֣לֶךְ פָּרַ֔ס דָּבָר֙ נִגְלָ֣ה לְדָֽנִיֵּ֔אל אֲשֶׁר־נִקְרָ֥א שְׁמ֖וֹ בֵּלְטְשַׁאצַּ֑ר וֶאֱמֶ֤ת הַדָּבָר֙ וְצָבָ֣א גָד֔וֹל וּבִין֙ אֶת־הַדָּבָ֔ר וּבִ֥ינָה ל֖וֹ בַּמַּרְאֶֽה׃
波斯王古列第三年，有一件事向那名叫伯提沙撒的但以理顯明；這事是真實的，關乎遙遠的漫長時期。這是要使他明白這事，並在異象中使他領悟。
Rashi
The years were partial: There are some of those years that we counted above, the beginning of which were absorbed in the previous year. For example, we counted five years for Darius the Mede and Cyrus - you will only find four. As it is written about the first year of Darius the son of Ahasuerus in the book of Daniel (10:1), "In the third year of the reign of Cyrus, etc." And we learned in Seder Olam: We only exclusively found one year for [the reign] of Media in the [holy] writings. And we found three years for Cyrus in the book of Daniel (10:1), "In the third year of the reign of Cyrus, etc." And we also learned in Seder Olam: Cyrus reigned for three partial years. Behold you counted an extra year (five instead of four). And also, since a year was absorbed in the years of Nebuchadnezzar and Evil-merodach. So corresponding to this, the building waited two years [at the time of the second] Darius.