Just to add to my post above:

Even if I can override the duration calculation, the rendering of a task 
for single day would be incorrect. Since it thinks single day task has 
duration of 0 days, the visual bar on the chart would not render. I could 
possibly live w/ that for the time being until google introduce time 
component to the gantt chart.


On Wednesday, 21 September 2016 13:19:16 UTC-4, ActiveX wrote:
> All,
> We're using Google Gantt chart in our project management software to 
> display scheduled tasks. The problem is that when a task begins, for ex: on 
> Sep 21 and ends on Sep 21, the gantt chart calculates this to have  a 
> duration of 0 days which in the context of scheduling is incorrect. A day 
> still has 24 hours and this task has a duration of 1 days.
> As a workaround, I decided to calculate the duration myself, ie. I 
> specified in my json start/end dates and duration but the gantt chart 
> ignores my duration and simply subtracts the dates and returns 0 days for 
> the duration. This is weird because the documentation says otherwise (from 
> docs: If start/end/duration all present - Check that duration is 
> consistent with start/end times. Throws error if inconsistent.)
> You might say, why I don't add +1 day to end date,- yes that will fix the 
> duration calculation but now the displayed end date will be wrong.
> At the minimum the Gantt chart should allow me to override the duration. 
> In the future, I think it would be great if the Gantt chart supported 
> date/time or would handle the calculations in 2 different ways (or modes if 
> you like).
> Any suggestions would be appreciated.
> Thanks,
> lk

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