How i can validate dates. Example: if a date is 01-09-2016 and want to change to 29-08-2016 how i can do that?
Hello,
you can check task dates when user moves them via dnd or when the lightbox is saved.
Please check this articles:
docs.dhtmlx.com/gantt/api__gantt … event.html
docs.dhtmlx.com/gantt/api__gantt … event.html