Hi @Dominic_Glenn,
It is possible to bind custom calendar, to the task property, like in the following snippet: http://snippet.dhtmlx.com/ecb55ff8e
You can create as many calendars you want, and bind them to the custom task properties, like "calendar_id": "twoDaysWeek"
API for task/resource/project calendars: https://docs.dhtmlx.com/gantt/desktop__working_time.html#assigningcalendartotask Important: project/resource calendars are available only in the PRO version, you can read more about them in the link at the link above.
Does it help you to solve the problem?
Get a guaranteed answer from DHTMLX technical support team
under the most suitable support plan