fix(plugin-timeline,core): the gantt axis draws a stored date-only day on that day in every zone, and the formula date functions do a calendar day's arithmetic on the UTC calendar (objectui#10866, slice 3)

fix(plugin-timeline,core): the gantt axis draws a stored date-only day on that day in every zone, and the formula date functions do a calendar day's arithmetic on the UTC calendar (objectui#10866, slice 3) #6324