When I create or update a date-field, on leaving the field the date is always 1 day after the date I've entered. For example, 01/10/2017 becomes 2/10/17; 01-Oct-17 becomes 2/10/17; 31-Oct-17 becomes 1/11/17; 31-Dec-17 becomes 1/01/18; 14/6/17 becomes 15/06/17. Note that a day is added during periods of Daylight Saving and Standard Time.
This happens no regardless of whether I select a date from the date-picker, or enter it manually as e.g. 01-Oct-17, 01-Oct-2017, 1/10/17, 2-9-17.
Windows is set to Region = New Zealand, Date & time = (UTC+12:00) Auckland, Wellington; Adjust for daylight saving time automatically = ON.
This issue was happening on 6.8.465 too. I've just updated to 6.8.469 and it's still happening.
1Password Version: 6.8.469
Extension Version: n/a
OS Version: Windows 10 17004.1000
Sync Type: 1Password