User Agent: Mozilla/5.0 (Windows NT 6.1; rv:54.0) Gecko/20100101 Firefox/54.0 Build ID: 20170628075643 Steps to reproduce: Two issues with creating an All Day Event in Thunderbird Calendar (beta version 54.0b3; does not exist in v52): 1) Click on All Day Event. 2) For multiple day event: Click on All Day Event (as above), then click on the down arrow of End date Actual results: 1) The date changes from the date originally shown to the prior day. So if the start date and time are shown at first as 07/28/2017, 5:00 PM, after clicking All Day Event, it shows as 07/27/2017, 12:00 AM (time grayed out). 2) I immediately get an Alert message: "The end date you entered occurs before the start date." It then gets caught in an infinite loop displaying this message; I have to use Task Manager to End Task to get out of it. Expected results: 1) Start date should display current date, 12:00 AM (time grayed out). 2) No error message should be displayed before I have a chance to set the date.
Component: Untriaged → General
Product: Thunderbird → Calendar
Version: 54 Branch → Lightning 5.6
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