Non working hours bug in Microsoft Project for the Web


Today I will show you a bug in Microsoft Project for the Web.

Let’s say that we have two Resources: John and Ellen. At 01/15/2021 John is suppose to work from 01:00 PM to 05:00 PM, and Ellen is not suppose to work at all.

So, let me setup a Resource Calendar for that:






and here we are:


and finally:


For John, I will repeat steps above and I will setup non working times like this:


So, working time for John looks like:


Now I will create new Project with two Tasks:


Ellen is going to work 32 hours form Monday to Thursday, and that is OK! BUT” Joh is going to work 32 hours as well, which is not OK, because he is suppose to work From Monday to Thursday 8 hours per day which is 4 days * 8 days per day = 32 hours PLUS 4 hours (from 01:00 PM to 05:00 PM) at Friday, which means that John total effort should be 36 hours, not 32 hours.

If you try this scenario in MS PROJECT 2013/2016/2019/ONLINE the result will be correct!



About Nenad Trajkovski

Location: Zagreb, Croatia Occupation: Project Manager Interests: Project Management and MS PROJECT He was born in Zagreb, Croatia at 1963. After completing his college he started working on projects in different business areas (banking, manufacturing, automotive industry, distribution, oil companies, etc.) developing and implementing ERP systems into different companies. He has got a lot of experience working with people in different business processes and also possesses great knowledge in information technologies and financial services. Today he works as a business consultant, adn Project Manager in PERPETUUM MOBILE d.o.o. Zagreb. He is a regular lecturer for Project Management in MS Innovation Center in Varaždin, Logosoft Sarajevo in Bosnia and Herzegovina and SEAVUS GROUP in Skopje Macedonia. He was named the best lecturer of WINDAYS 2008 while his lecture was also voted as the best. In addition, he was in TOP 10 lecturers at the MS SINERGY 2009 and MS VISIA 2009, 2010. Shares first place as the best lecturer of KulenDays 2009 and 2010 and PMI Conference 2009 in Zagreb. He is also a regular lecturer in the MS Community. He is a Certified Accountant and a PMP (Project Manager Professional) and a PMI-RMP (Risk Manager Professional), MCP, MCT, and Microsoft Certified Technical Specialist - Microsoft Project 2010. From 01.01.2012 awarded with MVP (Microsoft Most Valuable Proffesional - Microsoft Project)!
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