Page Comparison

import com.atlassian.jira.security.groups.GroupManager
import com.atlassian.jira.component.ComponentAccessor


def cfm = ComponentAccessor.getCustomFieldManager()
def issue = worklog.getIssue()
def endDateField = cfm.getCustomFieldObject('customfield_11300') //custom field id of date field we are interested
def endDate = endDateField.getValue(issue) as Date
if(endDate){
  if (worklog.getStartDate() > endDate + 1){
    return "You can only log time before or during ${endDate.format('dd.MM.yyyy')}"
  }
}