User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.2 Safari/605.1.15
Steps to reproduce:
Thunderbird 78.8.0 (German) on Macbook
Preparing to import a LOT of old calendars dates from csv files events were shifted from 2001 to the year 1.
Created a new calendar.
Exported a test event to csv file, reimported it.
Event time is shown in the overview panel off by 53 Minutes (added). When opening an edit window the time is correct. Screenshot appended.
The CSV and ICS file have the correct time.
Date is 2000 years off (missing). ICS file shows date with centuries zeroed. CSV file has date with year as two digits only (MM/DD/YY) which of course makes it quite a guess to reconstitute the century upon re-import. Manually adding the century in the CSV file resolves the problem.
TIME: Display should show time correctly. (Work needed)
DATE: Centuries should not get lost. (Solution: export year as four digits in the CSV file!)