Answer

Jains say “Micchami Dukkadam” on the day of Samvatsari, which is the final and most important day of Paryushan Parva.

Explanation

On Samvatsari, Jains perform Pratikraman and ask forgiveness from all living beings for any harm caused knowingly or unknowingly.

The phrase “Micchami Dukkadam” means:

“May all the wrongs I have done be forgiven.”

Spiritual Understanding

It is a day of humility, forgiveness, and purification of the soul. By saying “Micchami Dukkadam,” one reduces anger, ego, and attachment, and strengthens the Jain virtue of Kshamapana — forgiveness.

Takeaway

We say “Micchami Dukkadam” on Samvatsari day, at the end of Paryushan.