Is a tithi different in different countries?

No. A tithi is defined by the angle between the Moon and the Sun as seen from the centre of the Earth, so it begins and ends at the same instant everywhere. Only the local clock time of that instant differs.

Then why does the date of a festival change with the country?

Festivals are tied to a local moment: sunrise, the afternoon, the evening after sunset or midnight. When the same universal instant falls at a different local hour, the window that the tithi covers can move to the previous or next civil day.

Which way does the date move?

West of South Asia, local clocks are behind, so the Americas often keep an afternoon or evening festival a day earlier than Nepal. East of South Asia, clocks are ahead, so Australia and New Zealand occasionally keep it a day later.

Do India and Nepal differ because of the 15-minute time difference?

Rarely. Fifteen minutes only matters when a tithi begins or ends within minutes of a window's edge. Differences between Indian and Nepali dates more often come from different authorities, regional customs or rules.

Should diaspora families follow the Nepal date or the local date?

The classical rules are stated for the place where the rite is performed, so the local date follows the rule. Many families also follow the date of their home community. This site shows both: the official Nepal date and the computed date for each city.

Where can I see the date for my city?

Each covered festival page has a Dates by region table listing the computed date for Kathmandu, New Delhi, New York and more than thirty other cities.

Why the same festival falls on different days in Nepal, India and abroad

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