I downloaded the latest release of Gantt from the custom scripts website 8.4.0.39. When I run this on by test machine it appears fine, but not on my application. I copied the Gantt model over to my initial test environment and now ...
I have two tasks, 10-15 Mar 2020 & 10-15 Apr 2020 (We use GMT, so switching to DST on 20-Mar-2020). When I drag the end date I cannot make this a single day task, In my test machine I can get down to 1.5 days and in my application test machine it will only go down to 2 days.
I reported this last year (311320) and got a test solution. We were very close to our release date so did not have time to test and did not use it. On this basis I assumed it would have been fixed in the latest release, but it doesn't appear to be the case.