Sunday 19 February

How it was decided

1. 01

   Aṅga

   Caturdaśī runs from 00:35 on Mon 20 Feb to 00:22 on Tue 21 Feb.

   2012-02-19T22:34:37Z → 2012-02-20T22:22:16Z

2. 02

   Kāla

   Niśītha is 1 ghaṭikā either side of midnight: 00:05–00:53 on the 19th, 00:05–00:53 on the 20th.

   nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

3. 03

   Rule

   Caturdaśī must be present during niśītha. It covers 18 of 48 minutes on the 19th and 17 of 48 on the 20th.

   Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

4. 04

   Tie-break

   Both nights qualify and the cited authorities disagree. The one covered longer is ruled, as a boundary.

   priority: disputed → greater-coverage · margin 1043 s

5. 05

   Ruling

   Mahāśivarātri, Bucharest, 2012: Sunday 19 February.

   confidence: boundary (tie-break-disputed)

Say it like this

In Bucharest, Mahāśivarātri 2012 falls on Sunday 19 February. Caturdaśī runs from 00:35 on Mon 20 Feb to 00:22 on Tue 21 Feb and covers 18 of 48 minutes of niśītha that night. It also reaches the next night for 17 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

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Who says what

Institutional rulings are recorded with a source address, and are never edited to agree.