I have some task in GMT+1 and Others GTM+0

Why I have I some task in GMT+1 and Others GTM+0?
How I can to put all in same Timezone because I have some errors when gantt change automatically some tasks.

Hello Pedro,
Gantt stores the start_date an end_date in the Date format. So, it is handled by the browser. If you see different time zones, it means that some dates are in the summertime and others are in the wintertime. There is no way to change that:

Please, clarify what kind of issues you have.

The problem is with the auto Schedule when I delete or and a link or move the task fowards/backwards the autoSchedule change the dependencies task and leave the hour in the past day at 23h, ans all the dependencies stays like TR04 to the last dependence, on the left side is the error and on the right side it´s ok.
This only happened with the task that Autosheduling change.

This image is inside the onBeforeAutosheduling

An then in the gantt after redered it´s stay like this:

Hello Pedro,
I tried to reproduce the issue in the following snippet:
But when I move the task, its predecessors have the correct date:

If you can reproduce the issue in that snippet, please, clarify the name of the timezone you are using.

If you cannot reproduce the issue in that snippet, please, add your configuration there and make sure that the issue is reproduced there:
Then, click on the Share button and send me the link.
Or send me a ready demo with all the necessary Javascript and CSS files so that I can reproduce the issue locally.

Hello, thanks for the help.
I update the version of gantt to the latest version and it´s start to work correctly.
Looks like the version 7.1.4 has the config parameter “gantt.config.server_utc” always true, even if I put the value false.