Trouble commiting DueDate after setting it with groovy/script runner [JIRA] - groovy

Question

Currently, we have routine issues where the status resets each week. This escalation service is working as intended. However, we are trying to incorporate the following script to adjust the system field 'DueDate' to be set for 7 days from the date when the escalation fires. The following code updates the date and returns the correct value but it doesn't appear to be committing the date of the provided ISSUEKEY.
Here is our code:
import java.util.Date
import java.sql.Timestamp
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.MutableIssue
def customFieldManager = ComponentAccessor.getCustomFieldManager()
IssueManager im=ComponentAccessor.getIssueManager()
MutableIssue issue = im.getIssueObject('ISSUEKEY')
issue.setDueDate(new Timestamp((new Date() + 7).time))
issue.getDueDate()

Answer 1

What you are doing is correct but you need to commit your changes by calling IssueManager.updateIssue
import com.atlassian.jira.event.type.EventDispatchOption //add-this-line
import java.util.Date
import java.sql.Timestamp
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.MutableIssue
def customFieldManager = ComponentAccessor.getCustomFieldManager()
IssueManager im=ComponentAccessor.getIssueManager()
MutableIssue issue = im.getIssueObject('ISSUEKEY')
issue.setDueDate(new Timestamp((new Date() + 7).time))
issue.getDueDate()
def currentUser = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()//add-this-line
im.updateIssue(currentUser, issue, EventDispatchOption.DO_NOT_DISPATCH , false) //add-this-line
You are setting the issue value correctly but you are not saving your changes
IssueManager.updateIssue will save any changes