JSJonesherine Stephen Syncfusion Team August 12, 2016 12:54 PM UTC
We regret for the inconvenience caused.
We were able to reproduce the issue while calculating endDate in 8 hours workingTimeScale and we have confirmed this as bug and logged a report on this. Also we have created a support incident under your account to track the status of this issue.
Please log on to our support website to check for further updates.