בִּשְׁנַ֣ת שָׁל֗וֹשׁ לְכ֙וֹרֶשׁ֙ מֶ֣לֶךְ פָּרַ֔ס דָּבָר֙ נִגְלָ֣ה לְדָֽנִיֵּ֔אל אֲשֶׁר־נִקְרָ֥א שְׁמ֖וֹ בֵּלְטְשַׁאצַּ֑ר וֶאֱמֶ֤ת הַדָּבָר֙ וְצָבָ֣א גָד֔וֹל וּבִין֙ אֶת־הַדָּבָ֔ר וּבִ֥ינָה ל֖וֹ בַּמַּרְאֶֽה׃
바사 왕 고레스 삼년에 한 일이 벨드사살이라 이름한 다니엘에게 나타났는데 그 일이 참되니 곧 큰 전쟁에 관한 것이라 다니엘이 그 일을 분명히 알았고 그 이상을 깨달으니라
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.