Get/set Date field value using behavior in jira

[Dharnesh]

Hi Experts

Need help.....!

Using behavior script- trying to achieve below

Need to Get value of Custom date field and then need set new value(10 days from the date selected in custom field) in Due Date field.

For example 
Custom field Datefield selected as 26/Feb/2021
The in DUE DATE, need to set (10+(datefield Value)). So due date would be 7/Mar/2021

Can please help with logic and script.

[Burak Kaya]

Hi there,

You may use the script below;

Please do not forget to change the cf ID and username for the operation before use it.

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.fields.CustomField
import com.onresolve.jira.groovy.user.FieldBehaviours
import com.atlassian.jira.event.type.EventDispatchOption
import com.atlassian.core.util.DateUtils
import com.atlassian.jira.security.JiraAuthenticationContext
import com.atlassian.jira.user.ApplicationUser
import java.text.SimpleDateFormat

import groovy.transform.BaseScript

@BaseScript FieldBehaviours fieldBehaviours

def issueManager = ComponentAccessor.getIssueManager()
def issue = underlyingIssue
def customFieldManager = ComponentAccessor.getCustomFieldManager()

MutableIssue mTarget = (MutableIssue) issue

JiraAuthenticationContext authContext = ComponentAccessor.getJiraAuthenticationContext()
authContext.setLoggedInUser(ComponentAccessor.getUserManager().getUserByName("admin")) //type username for change operation
ApplicationUser automationUser = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()

def dateFieldCF = ComponentAccessor.getCustomFieldManager().getCustomFieldObject("customfield_11998") //type cf id of the date field
def dateFieldValue = issue.getCustomFieldValue(dateFieldCF).toString()
def newDate = new SimpleDateFormat("dd.MM.yyyy").format(dateFieldValue).plus(10)

mTarget.setCustomFieldValue(dateFieldCF, newDate)
issueManager.updateIssue(automationUser, mTarget, EventDispatchOption.DO_NOT_DISPATCH, false)

Best Regards,
Burak