The period between 500 BCE (Before Common Era) and 500 CE (Common Era) is 1,000 years. BCE refers to the years before the birth of Jesus Christ, and CE refers to the years after. The transition from 500 BCE to 500 CE covers both eras, so you count the years from 500 BCE to 1 BCE (499 years) and then from 1 CE to 500 CE (500 years). Adding these together gives a total of 1,000 years. This time span is significant in history as it covers major cultural, political, and social changes.

This question related to Chapter 4 Social Science Class 6th NCERT.
From the Chapter 4. Timeline and Sources of History.
Give answer according to your understanding.