If you need to know which tithi to use for a sankalpa, vrata, puja, or daily calendar entry on October 13, the important detail is a late-evening change. Tuesday, October 13, 2026 is Shukla Paksha Tritiya until 10:19 PM, after which Shukla Paksha Chaturthi begins.
That gives you a clear working answer for most ordinary purposes. It does not, by itself, establish a complete muhurta. If your observance depends on the exact moment of transition, confirm the timing in a Panchang calculated for your city.
October 13 Panchang at a glance
| Calendar detail | October 13, 2026 |
|---|---|
| Weekday | Tuesday |
| Paksha | Shukla Paksha, the waxing or bright half of the lunar month |
| Tithi before the stated changeover | Tritiya, the third tithi |
| Changeover time | 10:19 PM |
| Tithi after the stated changeover | Chaturthi, the fourth tithi |
The most useful way to read this table is as two intervals within one civil date. Before the stated transition, the operative tithi is Tritiya. After it, the operative tithi is Chaturthi. The tithi does not wait for midnight to change.
Which tithi should you use for your observance?
For a practice performed before the changeover, use Shukla Paksha Tritiya when the rule calls for the tithi prevailing at the time of worship. For a practice performed after the changeover, use Shukla Paksha Chaturthi under that same kind of rule.
The phrase when the rule calls for it matters. Hindu observances do not all select their day in the same way. A tradition may look at the tithi prevailing at sunrise, the tithi during a prescribed worship period, or another rule received through its sampradaya. A late-night transition therefore does not automatically move every vrata or festival observance to the next civil date.
- Identify the practice you intend to perform. Do not assume that every puja, vrata, or samskara follows the same calendar rule.
- Check whether your family, temple, or sampradaya uses the sunrise tithi or the tithi prevailing during the actual ritual.
- Note the place where the observance will occur. Panchang boundaries are location-dependent.
- Compare the city-specific transition with the planned ritual time.
- When the observance has a prescribed procedure, follow that procedure rather than choosing between Tritiya and Chaturthi by convenience.
If you are recording the day in a personal diary rather than determining a formal observance, the simpler notation is enough: Shukla Paksha Tritiya through 10:19 PM, followed by Shukla Paksha Chaturthi.
Why the tithi change is not a complete muhurta
A Panchang is traditionally understood through five limbs: vara, tithi, nakshatra, yoga, and karana. Here, the weekday and tithi are clear: Tuesday and the transition from Tritiya to Chaturthi. Those two facts alone cannot tell you that every moment before or after 10:19 PM is auspicious.
This distinction prevents a common planning mistake. A tithi tells you which lunar day is operating; a muhurta asks whether a particular time is suitable for a particular act. The purpose of the act, the location, and the other calendar factors may all affect that decision.
- For daily prayer or a general calendar note, the tithi boundary may be all you need.
- For a tithi-specific vrata, confirm the selection rule used by your tradition.
- For a major samskara or another ceremony requiring a muhurta, do not treat the Tritiya interval or Chaturthi interval as a ready-made auspicious window.
- For a temple programme, use the temple’s local Panchang and stated schedule; a timing published for most regions is not a substitute for a location-specific calculation.
Key takeaways
- October 13, 2026 falls on a Tuesday.
- Shukla Paksha Tritiya continues until 10:19 PM.
- Shukla Paksha Chaturthi begins after the stated transition.
- The tithi changes during the civil date, not at midnight.
- The stated tithi boundary does not by itself establish an auspicious time.
- A city-specific Panchang should decide any observance that depends on the exact transition.
For a general entry, mark Tuesday as Tritiya through the late evening and Chaturthi thereafter. Before fixing a time-bound vrata, puja, or samskara, check the same transition for your city and apply the rule followed by your tradition.



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