I inspire the children by letting them pick out a calendar that they like and just do it from there. Making it easy going and fun is so much more effective than a workbook. I also would print off those free online prints of the months so they could write all over them. It was easy to find places to stick in practice. "Mom, how much longer until my birthday?" "Let's see, your birthday is in May, now...what month is it now?" "January" "Ok, yes, you are right, it IS January, I almost forgot. Now let's see, what comes next...." Then we will recite them again and count it out. I act all nice about it, not like I am drilling them. I would also, when we first started, would look at what day it is, and then ask what yesterday is, and then what tomorrow will be, and then recite the whole week. I would do that a little more formally to make sure we got it in daily. I made a list of the days in big print and hung them on the wall near our calendar area.
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I hope that helps!