Calendar numbers (5)
I believe the answer is:
dates
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">calendar numbers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for dates that I've seen before include "Particular times" , "Small tree-fruits or social appointments" , "Occasions" , "Palm fruit" , "Sweet edible fruits of a palm" .)