Are these misspellings of 'calendric' and 'calendrical' respectively or alternatives? 'Calendaric' gets over 12k of goohits which is a few - almost half of the 26k 'calendric' gets - but that is probably not an astounding statistic for words that are long or have odd spellings, I guess.

BTW, I like calendrical rather than calendric for the flow of that extra syllable before the noun, and noted that 'calendrical' has been used on the board thrice whereas calendric has not been used at all - but Goolgle paints a different picture of their relative popularity.