When I set estimated hours for Epics,user stories ,it does not calculate correct time for tasks in u

[Sumedh Sarode]

When I set estimated hours for Epics,user stoires ,it does not calculate correct time for tasks in user stories.

for e.g 

1. I created one Epic and did'nt set any time estimate but entered due date ,for example if today is 21st May ,I set due date as 24th May

           2. I created user story US01 in that epic and did'nt enter any estimate in user story as well

           3.  I created 3 sub tasks ,development,design.testing in user story US01 and entered 2 days for each task , 3 subtaks tasks time  sums upto 6 days but it does'nt change the due date set for Epic. How do I set the estimate days /hours in JIra for epics/user stories/tasks?

[Nic Brough -Adaptavist- · Accepted solution]

First, you are making a couple of incorrect assumptions about the relationships between issues. 

• Whilst some issues can group together others, or contain subtasks, they do not affect the data on each other directly.  Put an estimate on an Epic is fine, but it won't affect the stories the Epic might contain. 
• You also are assuming that due dates and estimates are related.  Again, they are not.  I might ask for something to be done by next Monday (a due date), but my estimate has nothing to do with that - it's an estimate of how much time I will spend on it.  Could be 15 minutes, could be 20 days.

If you want to build relationships between fields in separate issues, that's fine, but you will need to do some coding to enable it all.

[Sumedh Sarode]

Great Thanks.

Can you guide how do I estimate user stories including tasks for the user stories? 

Regards

Thanks.

[Nic Brough -Adaptavist-]

You'll need to use one of the automation or scripting apps (you could write this stuff yourself as a new app, but that's inflexible and hard to maintain).  These enable you to write bespoke processes or code inside the application, so you can write things that trap "story updated, add up new numbers on Epic" or "Epic estimate changed, recalculate due date" and so-on, according to your desired rules