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As I was reading Al Hanisim this year, something odd struck me "לְחֹדֶשׁ שְׁנֵים עָשָׂר" - the 12th month. What struck me was that this year is a leap year so we actually celebrated Purim in the 13th month Adar Sheini (bet). I am assuming that the year the purim story happened was not a leap year hence purim that year was in fact the 12th month. But if thats the case, what is the significance of mentioning לְחֹדֶשׁ שְׁנֵים עָשָׂר in Al Hanisim, it seems to imply Purim should be in the 12th month - which halachically is not so....?

Based on Why is Purim on Adar II during a leap year?, thanks @Yishai, I would like to add to my question -Why does the megillah emphasize "bi-Shloshah Asar le-Chodesh Shneim Asar" - that Purim was in the 12th month?

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Highly related: judaism.stackexchange.com/questions/35519/… –  Yishai Mar 18 '14 at 22:13
Why would you assume Purim happened in a non-leap year? The Yerushalmi says otherwise. –  Double AA Mar 18 '14 at 22:16
For what it's worth, neither Rambam's Seder ha-Tefilah (Mechon Mamre edition) nor Siddur Rav Saadiah Gaon have "bi-Shloshah Asar le-Chodesh Shneim Asar, Hu Chodesh Adar" in Al ha-Nisim, but Seder Rav Amram Gaon does have it. –  Tamir Evan Mar 19 '14 at 9:11
(1) That question asks why we celebrate Purim in the 2nd Adar not the first because of the verses that make a point of mentioning it being in the twelfth month. You're basically asking the same question the other way round. (2) What if I have an answer to your first question, and find the answer(s) posted to the question there equally satisfactory (or unsatisfactory), and have no answer of my own to it? (3) At the very least, your second question has no direct link to the 'wording of Al ha-Nisim' question, and should be asked separately. –  Tamir Evan Mar 23 '14 at 10:16
@DoubleAA is referring to the Y'rushalmi on M'gilla 1:5: ר' לוי בשם רבי חמא בר חנינה אותה השנה היתה מעוברת מה טעמה (אסתר ג) מיום ליום ומחדש לחדש שנים עשר הוא חדש אדר. The Korban haEida and the P'nei Moshe comment (ad loc.) that the miracle happened in Adar II. The Korban HaEida explains the Y'rushalmi's reading of the verse: "To that which is annually the twelfth month, but which is now the thirteenth month". The P'nei Moshe indicates that this is hinted by the verse's phrasing "from month to month", which suggests that the usual 12th month was switched that year to be the 13th. –  Fred Feb 3 at 7:11

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