Hartālikā Tṛtīyā · Pārvatī and Śiva · the third bright tithi
What is Hartālikā Tṛtīyā?
Hartālikā Tṛtīyā, widely called Hartalika Teej in Hindi and English, is a vrata and festival on Bhādrapada Śukla Tṛtīyā. Its stories and practices center especially on Pārvatī's steadfast devotion and her union with Śiva.

The calendar words
Tṛtīyā is the third tithi.
Pārvatī, resolve, and regional practice
Participation varies across regions and communities.
Many traditions emphasize women's observance and may include fasting, Pārvatī and Śiva pūjā, songs, storytelling, dressing in festive clothing, or gathering with family and friends. Married and unmarried women may understand or undertake the vrata in different ways. Customs vary across northern, western, and central Indian communities.
Official references: Utsav, Ministry of Tourism · Marathi Vishwakosh
How Open Pañcāṅga identifies the date
These are the rules we use to identify Hartālikā Tṛtīyā.
Śukla Tṛtīyā must prevail at sūryodaya, local sunrise, and the named amānta lunar-month calculation must give the regular month Bhādrapada. When both rules match, the report identifies Hartālikā Tṛtīyā and explains the match.
These sunrise rules are deliberately limited. Some regional or traditional pañcāṅgas use additional timing rules, so another calendar may select a nearby civil date.