'King' in the Bible

In the second year of Darius the king, in the sixth month, on the first day of the month, came the word of Jehovah by the prophet Haggai unto Zerubbabel the son of Shealtiel, governor of Judah, and to Joshua the son of Jehozadak, the high priest, saying,

in the four and twentieth day of the sixth month, in the second year of Darius the king.