The issue is reproducible when I switch system time zone to the zone that has Daylight Saving Time. In this case, I use (UTC-05:00) Eastern time (US & Canada).

The problem has been forwarded to WebScheduler development team. It is filed under ASPNET-290.

I will keep you updated with any news I heard from the team regarding ASPNET-290.

Any update on ASPNET-290?

Your reported problem is already queued in the dev-team work items. However, it hasn't been processed further due to the release of 2016 R1 priorities and urgency.

I will keep you informed when the nightly build is available and ready to be evaluated.

Sorry for the delay in sending this.

Build 24 is now available in WebUI Studio 2016 Update 2 which addressed this issue. Please give it a spin and let us know how it works in your end.