Azariah's 38th Year (Judah); Zechariah Reigned 6 Months (Israel)
On the Gregorian calendar (the one you might have on your wall) the year was 706 BC.
On the Hebrew calendar, sometimes called the biblical calendar, the year was 3341 AM.
2 Kings 15:8 New King James Version (NKJV)
8 In the thirty-eighth year of Azariah king of Judah, Zechariah the son of Jeroboam reigned over Israel in Samaria six months.