function convertStringPropertyToLong(node, propertyName)
{
    var hasChanged = false;
    if (node.hasProperty(propertyName)) 
    {
      	var property = node.getProperty(propertyName);
        if (property.getType() == 1) // 1 is for string
        {
    	    var valueAsString = property.getString();
        	property.remove();
            if (valueAsString)
            {
    	        var value = Number(valueAsString);
      	        node['setProperty(java.lang.String, long)'](propertyName, value);
       	        hasChanged = true;
            }
        }
    }
    
    return hasChanged;
}

var qm = session.getWorkspace().getQueryManager(); 
var query = qm.createQuery("//element(*, ametys:zoneItem)[@ametys-internal:type = 'SERVICE' and @ametys-internal:service = 'org.ametys.blog.service.PostsService']", javax.jcr.query.Query.XPATH);
var nodes = query.execute().getNodes(); 
var count = 0; 
while (nodes.hasNext()) 
{
    var node = nodes.nextNode().getNode("ametys:service_parameters");
	var hasChanges = false;
	
	hasChanges = convertStringPropertyToLong(node, "ametys:year") || hasChanges;
    hasChanges = convertStringPropertyToLong(node, "ametys:month") || hasChanges;
  
    if (hasChanges)
    {
       count++;
    }
    	
}

session.save(); 
print(count + " updated posts services.");