I have version 1.0.4, build 1.3.0 and don't get date update on icon until I open it up, then it's right. Here's a screen shot of how I have it setup. View attachment 72812
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You got the latest and you are setup correctly. Can you try other calendar apps and see if theirs is updating correctly on your phone? It won't help much, but it will tell us if it's your phone that has the problem or the app. Thanks for your patience!