dative plural of Jahr

the time around Christmas and New Year, with different precise understandings:; (strictest) between Christmas and New Year: December 27 to 31 / the time around Christmas and New Year, with different precise understandings:; (most usual) from Christmas Eve through New Year: December 24 to January 1 / the time around Christmas and New Year, with different precise understandings:; (broader) from Christmas Eve through Epiphany: December 24 to January 6 / the time around Christmas and New Year, with different precise understandings:; (broadest) during the Christmas vacation: maximally December 21 to January 8 (depending on the year and jurisdiction)

(colloquial) double plural of Jahr (“year”), used in the sense of English ages