Passover Date

I calculated from Passover in 1447 BC (the first Passover) which was March 21st to Passover in 1994 AD. And according to the formula I used (which was the same formula Mr. Camping used to arrive at certain key dates) Passover in 1994 AD occurred on Saturday, March 26th.

The date of March 26th was correct according to Grok:

"Passover in 1994: Passover begins on the 14th of Nisan at sunset. If the Seder was on the evening of March 26, 1994, this corresponds to the start of Nisan 14, 5754. Since the Jewish day begins at sunset, Nisan 14 includes the evening of March 26 and the daytime of March 27, 1994.

The first day of Nisan 1, 5754, would thus be approximately 13 days earlier, around

March 13–14, 1994 (since Nisan 14 follows Nisan 1)."

I then asked Grok to calculate the number of days between the first day of the first month and the 1st day of the 7th month in 1994.

"Calculating the Interval: From Nisan 1 to Tishrei 1, the months are Nisan, Iyar, Sivan, Tammuz, Av, and Elul.

Total days: 30 (Nisan) + 29 (Iyar) + 30 (Sivan) + 29 (Tammuz) + 30 (Av) + 29 (Elul) = 177 days."

I calculated a different way to confirm this. From the 1st day of the 1st month to the 1st day of the 7th Hebrew month is:

6 x 29.530588 = 177.183528 rounded off to 177 which matches Grok's number above.

The rest of Grok's response shows one of the reasons why online Hebrew calendar converters cannot be trusted:

Grok continues:

"Estimating Tishrei 1, 5754: Starting from Nisan 1, 5754 (approximately March 13–14, 1994), adding 177 days brings us to around SEPTEMBER 7-8, 1994.

Rosh Hashanah 5754 (1 Tishrei) is historically recorded as beginning on the evening of September 5, 1994.

This slight discrepancy (177 days landing on September 7–8 vs. September 5) is due to the Rosh Hashanah POSTPONEMENT RULES, which can SHIFT Tishrei 1 by one or two days to avoid inconvenient days of the week. In 5754, September 5, 1994, was a Monday, a valid day for Rosh Hashanah (as it avoids Sunday, Wednesday, or Friday)."

The Hebrew calendar converter "postponement rules" changes the date of the 1st day of the 7th month in Grok's own estimate from September 7th to September 5th:

Finally, September 5th is the date Grok gives for Tishri 1 in the year 1994.

"Estimating Tishrei 1, 5754: Starting from Nisan 1, 5754 (approximately March 13–14, 1994), adding 177 days brings us to around September 7–8, 1994.

Rosh Hashanah 5754 (1 Tishrei) is historically recorded as beginning on the evening of September 5, 1994.

This slight discrepancy (177 days landing on September 7–8 vs. September 5) is due to the Rosh Hashanah postponement rules, which can shift Tishrei 1 by one or two days to avoid inconvenient days of the week. In 5754, September 5, 1994, was a Monday, a valid day for Rosh Hashanah (as it avoids Sunday, Wednesday, or Friday)."