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This article explains a step by step instructions on how to copy the value of the next due date custom field into the due date field by using the COT app.

Instructions

The following is the custom field called "next due date"(custom field type is a date) and its value is set to 18/Dec/19.

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1.  Login as an Administrator in your JIRA instance.
2. Select the projects from the menu bar and click on the project name else go to the projects list and click on the project.
   
3. Click on the Project settings in the Project Page to administer the project 
   
4. Go to workflows section and click on the pencil icon from the workflow scheme.
   
5.  Click on the transition, you already set for(ex: Done) and update the post Functions
   
6. Click on the post Functions and then Click on the pencil icon.
   

7. Click on Detailed Fields and then set the substitutional variable %original_customfield_10300% into the Due date field. As per this post Function, when you click on the Done status in the Jira issue from the respective project, the value of the next due date will be copied into the Due date custom field. If you are not sure of custom field id then follow the below steps. 
   
   
   Note: Please follow the below steps to get the next due date custom field ID
      1. Login as an Administrator in your JIRA instance.
      2. Click on the Issues from the dropdown list
           
         3.  Go to Issues from the top menu bar and click on Custom Fields
             
          4. Search for the next due date custom field and click on Cogwheel() and then click on Configure button.
              
           5.  You will see the custom Field ID from the URL.
              
            
      
    
   

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