This is brilliant. Thanks so much for your help Richard!

I’ve been trying to crack this for ages, but I feel like I’m getting more confused and further away from a solution the longer I go. I always get a ‚ÄòCustom Expression Invalid’ error when trying to use WEEKDAYDIFF. I expect it to be something like the below: =IF((WEEKDAYDIFF({DE:POSDELDATE}, Today)...