How can we show start time and stop time in task gantt? about svelte-gantt

[ANovokmet]

Tasks contain moment which can be formatted and used in labels as you wish.
You can define taskContent for each task like this:

const options = {
    taskContent: (task) => `${task.label} ${task.from.format('HH:mm')}`
}

or you can update the label in the change event (happens before the actual change in the Gantt store)

gantt.api.tasks.on.change(([data]) => {
    const task = data.task.model;
    // be sure to add the "name" property
    task.label = `${task.name} ${task.from.format('HH:mm')}`;
});

[kesyous]

Very thanks,
Can we move the conflicting others forward?

[ANovokmet]

Very thanks,
Can we move the conflicting others forward?

I suggest you find the conflicting tasks in the source collection, move their from and to and use gantt.$set({tasks: updatedTasks}).

Gantt exposes a function updateTask(task), that upserts a single task, but something like upsertAll(tasks) would be nice too.