getSubtaskDates

calculates the combined start/end dates of tasks nested in a project or another task

task_id

string | number

the task's id, root_id will be used if not specified

object

an object containing the start_date and end_date properties

Example

// duration of the whole project
let dates = gantt.getSubtaskDates();
const dateToStr = gantt.templates.task_date;
 
console.log(`${dateToStr(dates.start_date)} - ${dateToStr(dates.end_date)}`);
 
// duration of the subproject
dates = gantt.getSubtaskDates(1);
 
console.log(`${dateToStr(dates.start_date)} - ${dateToStr(dates.end_date)}`);

The method returns an object containing the start date of the earliest subtask and the end date of the latest subtask.

The return object has the following format:

{
  start_date: Date|null,
  end_date: Date|null
}

If a Gantt chart has any scheduled tasks, both properties will have date values. If the Gantt chart is empty or contains only unscheduled tasks, both properties will have null values.

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