Accuracy report 2023
Festival dates of 2023 compared with the official lists, and sunrise, sunset and Moon phases compared with the U.S. Naval Observatory.
Generated 2 Nov 2026, 11:19 UTC · engine 1.4.2 · profile North Indian · Lahiri (calibrated)
State Government holiday lists
Holiday notifications of State Governments, each compared at a city of that state. www.india.gov.in
18 dates compared: 17 the same, 1 different with a known reason, 0 not yet explained.
Differences
| Official date | Name in the official list | Our festival | Our date | Result | Notes |
|---|---|---|---|---|---|
| 07/09/2023 (Thu) | Janam Ashtami (chandigarh) | Krishna Janmashtami | 06/09/2023 (Wed) (-1) | Different | Why the dates differConvention (as state:punjab-2022:krishna_janmashtami): Krishna Ashtami ran 6 Sep 15:38 to 7 Sep 16:14 IST. At Chandigarh the Nishita of 6/7 Sep is in Ashtami (Smarta, the engine's rule: 6 Sep); Ashtami prevails at sunrise (06:02) only on 7 Sep, the day the Punjab notification (Schedule #16) lists. The engine's Vaishnava (ISKCON) date, computed beside it (occurrence.traditions), is 7 Sep, the listed day; the notification names no tradition, so the row is compared with the profile's (Smarta) date. |
All 18 compared dates
| Official date | Name in the official list | Our festival | Our date | Result | Notes |
|---|---|---|---|---|---|
| 13/01/2023 (Fri) | Lohri (chandigarh) | Lohri | 13/01/2023 (Fri) | Same date | Source |
| 26/01/2023 (Thu) | Basant Panchmi/ Birthday of Satguru Ram Singh Ji (chandigarh) | Vasant Panchami (Saraswati Puja) | 26/01/2023 (Thu) | Same date | Source |
| 18/02/2023 (Sat) | Maha Shivaratri (chandigarh) | Maha Shivaratri | 18/02/2023 (Sat) | Same date | Source |
| 08/03/2023 (Wed) | Holi (chandigarh) | Holi (Dhulandi) | 08/03/2023 (Wed) | Same date | Source |
| 30/03/2023 (Thu) | Ram Navami (chandigarh) | Ram Navami | 30/03/2023 (Thu) | Same date | Source |
| 04/04/2023 (Tue) | Mahavir Jayanti (chandigarh) | Mahavir Jayanti | 04/04/2023 (Tue) | Same date | Source |
| 14/04/2023 (Fri) | Vaisakhi/ Birthday of Dr. B.R. Ambedkar (chandigarh) | Vaisakhi (Baisakhi) | 14/04/2023 (Fri) | Same date | Source |
| 22/04/2023 (Sat) | Idu'l Fitr/ Lord Parshuram Jayanti (chandigarh) | Parshuram Jayanti | 22/04/2023 (Sat) | Same date | Source |
| 05/05/2023 (Fri) | Buddh Purnima (chandigarh) | Buddha Purnima | 05/05/2023 (Fri) | Same date | Source |
| 31/05/2023 (Wed) | Nirjala Ekadashi (chandigarh) | Ekadashi (Shukla) | 31/05/2023 (Wed) | Same date | Source |
| 07/09/2023 (Thu) | Janam Ashtami (chandigarh) | Krishna Janmashtami | 06/09/2023 (Wed) (-1) | Different | Why the dates differConvention (as state:punjab-2022:krishna_janmashtami): Krishna Ashtami ran 6 Sep 15:38 to 7 Sep 16:14 IST. At Chandigarh the Nishita of 6/7 Sep is in Ashtami (Smarta, the engine's rule: 6 Sep); Ashtami prevails at sunrise (06:02) only on 7 Sep, the day the Punjab notification (Schedule #16) lists. The engine's Vaishnava (ISKCON) date, computed beside it (occurrence.traditions), is 7 Sep, the listed day; the notification names no tradition, so the row is compared with the profile's (Smarta) date. |
| 28/09/2023 (Thu) | Anant Chaturdashi (chandigarh) | Anant Chaturdashi | 28/09/2023 (Thu) | Same date | Source |
| 24/10/2023 (Tue) | Dussehra (chandigarh) | Vijayadashami (Dussehra) | 24/10/2023 (Tue) | Same date | Source |
| 28/10/2023 (Sat) | Birthday of Maharishi Valmiki Ji (chandigarh) | Valmiki Jayanti | 28/10/2023 (Sat) | Same date | Source |
| 01/11/2023 (Wed) | Karva Chauth (chandigarh) | Karva Chauth | 01/11/2023 (Wed) | Same date | Source |
| 12/11/2023 (Sun) | Diwali (chandigarh) | Diwali (Lakshmi Puja) | 12/11/2023 (Sun) | Same date | Source |
| 13/11/2023 (Mon) | Goverdhan Pooja (chandigarh) | Govardhan Puja | 13/11/2023 (Mon) | Same date | Source |
| 19/11/2023 (Sun) | Chhath Pooja (chandigarh) | Chhath Puja | 19/11/2023 (Sun) | Same date | Source |
Sunrise, sunset and Moon phases
Compared with the U.S. Naval Observatory (public domain): sunrise and sunset at sea level with standard refraction, and the instants of New Moon, Full Moon and the quarters. Differences in minutes, ours minus USNO. aa.usno.navy.mil
No USNO reference values for this year.
USNO publishes its times rounded to the minute, so differences up to about one minute are rounding. NOAA's solar calculator uses the same rise and set definition; its values are not stored here separately.
How the comparison is made
The official lists are transcribed by hand from the published documents (each tied to its file's checksum) and stored with the site's code; they are never adjusted to match our results. Our dates come from the same engine and default calculation profile as every page of the site.
A different date is not necessarily an error. Most differences come from a documented convention:
- Udaya tithi: many official lists take the tithi prevailing at sunrise, while the texts decide some festivals by the tithi at another part of the day.
- Vyapini rules: festivals such as Diwali (Pradosh), Janmashtami (midnight) or Navami are fixed by the tithi present at a particular time; when two days qualify, traditions choose differently.
- Regional rules: a state may follow its own solar or lunar calendar, month system (amanta or purnimanta) or local custom.
- Administrative dates: a government may keep a holiday on a fixed or convenient day.
The reason shown for each difference is the note recorded with the reference data (in English). A difference without a recorded reason is marked as not yet explained and reviewed.
This report shows how our calculated dates compare with these references; it is not a claim that any calendar is the only correct one. Traditions may vary.