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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 at 22:13
Why would you assume Purim happened in a non-leap year? The Yerushalmi says otherwise. –  Double AA Mar 18 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 at 9:11
@DoubleAA please quote the yerushalmi - based on ( thanks @Yishai) judaism.stackexchange.com/questions/35519/…, it seems difficult to accept literally. –  R. Mo Mar 19 at 14:01
Isn't your added question a re-wording of the question you linked to? –  Tamir Evan Mar 21 at 9:56

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