I was in month view, where I had an all-day event set to calendar "foo" today, I opened its edit dialog and bumped it to the next month by simply changing the "08" in "2017-08-27" to "09".

Two issues:

- In month view, the event change did not occur until I switched to the other month, otherwise it was still showing up in front of me in August, not telling me the transaction had been completed successfully.

- When switching to week view afterwards, the event was still showing up in the wrong week (as being today), even if I moved forward/backward in time with the arrows. Using the "Synchronize" action didn't solve it. I think it solved itself when I folded/unfolded the all-day events' expander at the top of the week view, or maybe I had to restart the app.