When exporting the Gantt Chart to Excel, the date format is not applied if there is data in the date format in other columns except start_date and end_date.
Hello,
Thank you for letting us know about that issue. It seems that the issue is not related to the date_format property.
The custom columns with the date values have the dates stringified into the ISO format, and it means it depends on the current time zone. As a result, you can even get the value of a previous day instead of the actual value. The date_format property only confuses how it works.
I added it as a bug to our internal bug tracker. The dev team will fix the bug in the future, but I cannot give you any ETA.
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