Smarta vs Vaishnava Ekadashi: Why Fasting Dates Differ

Why can one Ekadashi have two fasting dates?

A listing headed ‘Ekadashi begins’ is the start of an astronomical lunar interval. A listing headed ‘Ekadashi fast’ is a calendar’s decision about when to observe the vrata. Comparing one with the other creates a disagreement that may not actually exist. First check that both pages are showing the same kind of information.

The comparison below explains a common reason for a split and follows a real historical example. It is a guide to reading calendars; it is not a replacement for the complete observance rules used by your family, temple or sampradaya.

Tithi, sunrise, arunodaya and Parana

A tithi is based on the angular separation of the Moon and Sun. Each of the thirty tithis spans 12 degrees of that separation. It does not last a fixed twenty-four hours and can begin or end at any civil clock time. Ekadashi is the eleventh tithi in either half of the lunar month; Dashami precedes it and Dwadashi follows it.

Sunrise is a local event determined by date, coordinates and the adopted sunrise convention. Arunodaya is a pre-sunrise checkpoint: many Gaudiya Vaishnava calendars use four ghatikas, commonly expressed as 96 minutes, before sunrise. It is not the same thing as civil midnight or a fixed 04:00 on every date.

Parana means breaking the fast. Its date and permitted interval must be checked for the observance you actually follow. The end of Ekadashi tithi is not, by itself, an instruction to break the fast at that moment.

How the two calendar approaches compare

Viddha means affected or mixed in this calendar discussion. It refers to the preceding Dashami touching the relevant checkpoint, not to a personal defect or a judgment about someone who follows a different tradition. ‘Vaishnava’ also covers more than one lineage; an ISKCON calendar should not be assumed to express every lineage’s full rule set.

A simple sunrise-versus-arunodaya explanation is helpful, but it is not a complete algorithm. Cases with no sunrise inside Ekadashi, two sunrises inside it, or special Dwadashi conditions need additional rules. A calendar can therefore select a fasting day even when a quick visual inspection of the tithi interval seems surprising.

Worked example: New Delhi, 25–26 March 2025

Papamochani Ekadashi in March 2025 provides a concrete comparison. The published New Delhi Smarta listing places the fast on 25 March. ISKCON Delhi’s own event listing places it on 26 March, with Parana on 27 March. These are historical dates used to demonstrate the method, not an upcoming fasting schedule.

For New Delhi at 28.6139° N, 77.2090° E, our calculation gives sunrise at approximately 06:19 IST on 25 March, using a level horizon and the standard astronomical sunrise convention. Subtracting 96 minutes gives approximately 04:43. Ekadashi begins around 05:05, between these two checkpoints.

The subtraction is straightforward: 06:19 minus 01:36 equals 04:43. At 04:43 Dashami has not ended; at 06:19 Ekadashi has begun. That is the distinction the two checkpoint tests can detect. The published calendar dates confirm the split in this case.

The times were reproduced with the local JPL DE440s astronomy engine. Tithi boundaries agree with the published listing to within a few minutes. Seconds have been omitted for readability. Small sunrise differences between publishers do not change the checkpoint ordering in this example; they still deserve attention when an event lies very close to a boundary.

Why some Ekadashis still need additional rules

The Moon–Sun separation changes at an uneven rate. An Ekadashi can begin after one sunrise and end before the next, leaving no sunrise inside its interval. It can also span two sunrises. Those cases cannot be decided reliably by searching for the word ‘Ekadashi’ beside one morning alone.

Vaishnava calendars may designate particular observances as Mahadwadashi, and different rule sets examine the duration and relationship of Ekadashi and Dwadashi. Gauna is a label readers may encounter for an alternate observance. These labels describe calendar selection; they do not mean that a second astronomical Ekadashi tithi has appeared.

Use the detailed calendar for the tradition you follow. If an exception is not explained, ask for the tithi interval, local sunrise, arunodaya checkpoint and the named rule. A confident answer should account for the actual case rather than repeat ‘always fast one day later.’

Which date should your household follow?

1. Identify your household or temple’s observance tradition before comparing dates.
2. Set the calendar to the place where you will observe the fast, including the correct timezone.
3. Read the labelled fasting date, not only the tithi start and end.
4. Check the accompanying Parana date and interval for that particular observance.
5. If two trusted calendars disagree, compare their inputs and rules or ask the temple that guides your practice.

There is no benefit in averaging two dates, switching traditions simply to obtain a convenient date, or assuming that more fasting must always be better. The useful decision is to understand the calendar your household follows and apply it consistently. Children, older adults and people with health needs should not be pressured into a fasting form that is unsuitable for them.

Following Ekadashi outside India

Convert an astronomical timestamp when you want to know the same instant in another timezone. Do not treat that conversion as a complete calculation of the overseas fasting date. Local sunrise and the community’s calendar rules still have to be evaluated. The civil date can also differ across timezones.

For an overseas observance, use a calendar calculated for your city or a nearby appropriate location. Confirm whether it follows the same tradition as your temple. Include daylight-saving rules where relevant. A screenshot labelled only ‘India time’ is insufficient for deciding a local pre-sunrise checkpoint abroad.

If you travel across timezones close to the observance, seek guidance from the community whose practice you follow. This is a different question from converting a single timestamp, and it should not be resolved by silently copying a Delhi date.

Common mistakes when reading two dates

The first mistake is treating Ekadashi tithi as a civil day running from midnight to midnight. The second is comparing a general Smarta date with an ISKCON observance without noticing the labels. The third is treating every split as a calculation error. A fourth is assuming every Vaishnava Ekadashi must fall one day after the Smarta date; many are observed on the same day.

Finally, keep Parana separate. A fasting date, a tithi ending at 03:45 and a later published fast-breaking interval can all be correct within the chosen calendar. The labels tell you what each time is for. Save those labels with the city and timezone when sharing information with family.

Continue with the calendar guides

Read how to convert 24+ Panchang times when a listing runs past midnight. Our guides to Panchang sunrise and the ISKCON Ekadashi calendar explain related terminology. Use the Panchang tool for local astronomical context, and your tradition’s observance calendar for the final fasting selection.

Frequently asked questions