It's truly amazing there is not a simple solution to this. We use FileMaker internally and I can easily add a custom sort option that allows us to sort anything anyway we want. In this case, all I have to do is sort based on a pre-sorted list. And, sorting follows the order of the list. Is there any decent work-around or solution for this issue? We use media months (first Monday of the month to last Sunday of the month) to define our months. So, we have to use custom calculated month fields. Sure would be nice to sort them!