I would like to see issues updated for example one month after the creation date.
Something like: updated >= (created + 30d)
How can I do it with JQL only (without add-on)?
OOTB you cannot do this w/ JQL. JQL doesn't support math functions. If this is something you will need on a regular basis then consider incorporating Automation and custom field. Something like this....
Now maybe there is a better solution if I better understood what you are hoping to achieve. I'm used to seeing request for 'issue not updated for xx days' but this is different.
I was looking for a simple JQL approach, but as I see I won't get it :) I also search for issues not updated for x days, but this time I was asked to provide a simple solution to filter issues where nothing happened x days after creation time (and maybe those issues are older).
You can probably get a list of issues using Automation For Jira as it has the ability to do a diff between date fields.
See this document for more guidance on using Smart Values to accomplish that:
Calling all Confluence Cloud Admins! We created a new Community Group to support your unique needs as Confluence admins. This is a group where you can ask questions, access resou...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events