I'm using an Aquaris E4.5 with the stock OTA-10.1 and latest calendar app from the store. But I found a similiar bug (Bug #1562654). Maybe this issue is related to Bug #1562654 and this bug here reported by @dennis is really fixed.
-- You received this bug notification because you are a member of DX Packages, which is subscribed to indicator-datetime in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1548031 Title: wrong date in series schedule Status in Ubuntu Calendar App: Fix Released Status in indicator-datetime package in Ubuntu: New Bug description: Had the Problem that i have some series schedule, but the Alarm ring one month to early. see attach 21.03.2016 is the schedule, but got today the alarm. Calendar App Version: 0.4.757 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-calendar-app/+bug/1548031/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp

