Re: Dynamic Dates with Task Lists

Hi Manish,
 
I understand that you want to use custom solution to calculate dynamic start and end dates. To research the issue, I would like to confirm whether you create a custom workflow with Microsoft SharePoint Designer. If so, based on the description, I couldn't find the "End Date" column from the current columns.
 
Considering that the issue is related with custom development, I will provide some links for your reference.
References:
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SharePoint Online for Office 365 Developer Guide
SharePoint Online Developer Resource Center
Introduction to designing and customizing workflows
Workflow conditions in SharePoint Designer 2010: A quick reference guide
Build Workflow Solutions for SharePoint Online
 
Thanks,
Ida Qiu