Hi, I was trying to set up Thunderbird, but I noticed that the calendar was showing incorrect date+time. I did find a [https://support.mozilla.org/en-US/questions/1373132 very similar issue] very similar issue, but that seems to be because of flatpak (which probably isn't the issue here because I am on MacOS). Current Time (real, also shown in Mac Menu Bar in screenshot): 03:52 of September 23rd. Time shown by Thunderbird: 22:30 (of the previous day apparently - Sept 22nd). (Also note how the time shown on the calendar has two days combined. Ideally, 22nd Sept and 23d Sept shouldn't be together in the "Day" view). Additional note: For fun, I created a new event for 23rd Sept at what seems like 01:30. After creating the event, the time seems to be set to 07:00 (which should be right, assuming that the "Waking Up" event is supposed to be at 09:00). Note that if I open the "Waking Up" event, the time is correctly shown. '''ThunderBird Information''': 115.2.3 (64-bit) '''System Information:''' MacOS Sonoma - Version 14.0 (23A339) System Timezone is set to be the same as the one in ThunderBird (Automatic Timezone setting in ThunderBird was even more wrong, by more than a day). Please forgive me if I missed something too obvious.