Answer

Dhoop Dashami is observed on the Dashami tithi of Bhadrapad Shukla Paksha in the Jain calendar.

It usually falls around August or September in the English calendar.

Explanation

On Dhoop Dashami, Jains offer dhoop as part of devotional worship. It is especially observed with reverence in many Jain communities during the period around Paryushan / Das Lakshan, depending on the tradition.

Takeaway

Dhoop Dashami is a day of devotion, purity, and worship through the offering of fragrant dhoop to the Arihant Bhagwan.