Updating a task description without changing start date

Gantt
#1

If I change the task name also the start date is changed and I don’t want this.
Take a look of this pic

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If I change the description, the task start date will be changed to 09:00 AM. In the database is saved as 09:15 and I want to keep this.

Also the time picker is in 1 hour interval. Can I have it in half an hour interval? Or an input where I can type the minutes? Documentation is here but I couldn’t find a solution

Thanks

#2

I solved using this sample

#3

Hello Mattia,
You can also try changing the time_step option:
https://docs.dhtmlx.com/gantt/api__gantt_time_step_config.html
Here is the snippet that demonstrates how it works:
http://snippet.dhtmlx.com/db775869b