Symptoms

After upgrade to London, Customer found an issue with field 'planned end date' present on project task form which shows the incorrect value {"status":"success","date":} for new project task as well on existing project task

Release

London-patch3

Cause

Custom Script include 'AjaxProjectTaskUtil'

Resolution

Reverting back the script include to OOTB resolves the issue

Additional Information

Script include "AjaxProjectTaskUtil" is responsible to calculate the end date and duration for the projects and project tasks which is being called by client script "Calculate End Date From Duration". This script include should be OOTB to avoid this kind of issues.