Ezra 7:8

7:8 He entered Jerusalem in the fifth month of the seventh year of the king.

Ezra 4:24

4:24 So the work on the temple of God in Jerusalem came to a halt. It remained halted until the second year of the reign of King Darius of Persia. ¹ 

Ezra 6:15

6:15 They finished this temple on the third day of the month Adar, which is the sixth ²  year of the reign of King Darius.

¹ sn Darius I Hystaspes ruled Persia ca. 522–486 b.c.

¹ sn The sixth year of the reign of Darius would be ca. 516 B.C.