I am not sure, what you exactly want to do. You can e.g. use JIRA's native feature of bulk processing multiple/selected issues and just delete the content of planned start and end dates of that issues. Does this help you?
Hello Atlassian Community! Each month, we run a series of Spotlights to highlight Marketplace vendors and apps that our team thinks this Community would find valuable. In last month's Spotlig...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs