Duration of milestone is displayed incorrectly in Gantt

[daniel.piret]

The milestone in the file has start and end date as '2018-07-27', but it is displayed in Gantt as '2016-07-27'
I checked this issue with gantt-4.0.8 version.
Please find attached file -

incorrect_date.json

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[alex.l]

Hi daniel.piret,

I downloaded your JSON and see that startDate of the project is set to "2016-09-27"

{
    "success": true,
    "type": "sync",
    "revision": 1,
    "project": {
        "calendar": "general",
        "startDate": "2016-09-27", // <----- here
        "endDate": "2024-11-30",
        "progressModel": "DURATION",
        "percentDone": 40,
        "hoursPerDay": 8,
        "daysPerWeek": 5,
        "daysPerMonth": 20
    },

If you remove it, startDate will be calculated according to your data.

All the best,
Alex