Dear Chanchal, the postponed exam date of ATMA exam is 2oth June 2020. Previously the exam date was announced to be on 24th May 2020, but due to covid-19 crisis, the exam date has been postponed.

For more details, keep a regular check on the official website

https://www.atmaaims.com/?AspxAutoDetectCookieSupport=1

I hope this helps you!