Diwali in November one year, October the next; Holi in March, except when it is not quite. Hindu calendar festival dates follow a lunisolar system — part moon, part sun — that keeps festivals aligned with both lunar months and solar seasons. The result is dates that move within a predictable window each year. Using 2026’s confirmed dates as examples, here is how the system works.
Lunisolar: The Best of Both Worlds
The Hindu calendar tracks lunar months (each beginning with a new moon, lasting about 29.5 days) but periodically inserts an extra month — Adhik Maas — to stay aligned with the solar year and its seasons. This is the key difference from the purely lunar Islamic calendar, which drifts through the seasons: the Hindu calendar’s leap-month mechanism keeps festivals roughly in their seasons. Diwali always falls in autumn, Holi always in spring — but the exact Gregorian date shifts within a window of several weeks from year to year.
2026 Examples: Diwali, Holi and More
India’s official 2026 holiday list shows the system in action. Holi falls on 4 March 2026, Diwali (Deepavali) on 8 November 2026, Dussehra (Vijay Dashami) on 20 October 2026, Ram Navami on 26 March 2026, Janmashtami on 4 September 2026 and Guru Nanak Jayanti on 24 November 2026. Each date is set by panchang calculations — traditional almanacs computed by astronomers — which determine the precise tithi (lunar day) on which each festival falls. The government lists are published well in advance, so unlike moon-sighting-dependent holidays, these dates are fixed once announced.
Why the Dates Still Move
If the calendar has leap months to stay aligned, why do dates move at all? Because the alignment is to seasons, not to the Gregorian calendar’s fixed months. A lunar month starting a few days earlier or later shifts every festival in that span, and the leap-month insertions periodically reset the relationship. The movement is bounded — Diwali will always be October/November, never July — but within that window, the exact date is a fresh calculation each year. Regional variations add another layer: some festivals are computed on slightly different panchang traditions in different parts of India.
Planning Around Hindu Festivals
For travellers and businesses, the practical takeaway is that Hindu festival dates are knowable well in advance — the government holiday lists and panchang almanacs publish them for the full year. Diwali week is India’s biggest travel surge, with trains and flights booking out months ahead; Holi sees domestic tourism spikes in Mathura, Vrindavan and beyond. Mark the 2026 dates early — Holi on 4 March, Diwali on 8 November — and remember that the days around each festival matter as much as the day itself for travel and closures.
It is also worth noting how the calendar shapes everyday life beyond the big festivals. The panchang governs auspicious timings for weddings, business openings and religious ceremonies throughout the year, which is why certain weeks see a concentration of celebrations — and why venues book out. For anyone doing business in India, glancing at the festival calendar before scheduling major launches or deadlines is simply good practice; the whole country, in a sense, runs on two calendars at once.