Regnal year dating
Some of the oldest dating systems were in regnal years.
A regnal year usually begins on the date of a monarch's accession to the throne. It is displayed as an ordinal, not a cardinal number.
And in the fourth month, in the ninth day of the month, the famine was severe in the city, so that there was no bread for the people of the land.
During this time Nebuzaradan had dealings with Jeremiah (Jeremiah 40:1-5), and shortly after was the time of gathering wine and summer fruits (Jeremiah ), which would be around the 6th month.The beginning of these calendars are six months apart, and when the regnal year of a particular king starts can be a very important issue.It would be even more complicated if Judah used a Nisan to Nisan regnal year, and the northern kingdom of Israel used a Tishri to Tishri regnal year, as the same event would be recorded by two different people as happening at different times according to their different time systems.Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. It is from the Latin regnum meaning kingdom or rule.