The concern with calendar time is they are:
1. concepts that preschoolers are not developmentally ready to "understand"
2. they are not learning the concepts, they are learning rote memorization
3. when an activity is not developmentally appropriate, as the OP is experiencine, it results in disinterest, lack of participation, frustration and the end result of misbehavior.
There are SO many more developmentally appropriate ways to teach these concepts without drilling children with rote memorization.
However, I will digress and allow the calendar advocates to further respond
