Metric definition for when an Incident goes from a "Resolved" state to "In Progress" (reopened)

[SB87]

I'm looking at creating a new metric definition to meet the below requirement:

1. Incident table
2. Records the date/time when an incident is reopened from a "Resolved" state. My observations is that an incident automatically goes into an "In Progress" state if reopened from a "Resolved" state. 

This is the incident.state options from the Choice table:

Table	Element	Language	Value	Label	Hint	Inactive	Sequence
incident	state	en	1	New		FALSE	1
incident	state	en	2	In Progress		FALSE	2
incident	state	en	3	On Hold		FALSE	3
incident	state	en	6	Resolved		FALSE	6
incident	state	en	7	Closed		FALSE	7
incident	state	en	8	Cancelled		FALSE	8

This is my draft/pseudo script:

(function() {
if(current.state == 2) { //if current state is "in progress"
if(previous.state == 6) { //if prev state was "resolved"
createMetric();

function createMetric() {
var mi = new MetricInstance(definition, current);
if(mi.metricExists =() )
return;
var gr = mi.getNewRecord();

//stuck at this part. Want to create a metric instance that records the date/time the reoepen event occured for a particular incident.

Any help greatly appreciated!