diff --git a/src/MiniDocs/GrafoscopioNode.class.st b/src/MiniDocs/GrafoscopioNode.class.st
index 68f5379..7e9274b 100644
--- a/src/MiniDocs/GrafoscopioNode.class.st
+++ b/src/MiniDocs/GrafoscopioNode.class.st
@@ -81,9 +81,19 @@ GrafoscopioNode >> created: anObject [
 	created := anObject
 ]
 
+{ #category : #accessing }
+GrafoscopioNode >> earliestCreationDate [
+	| earliest |
+	
+	earliest := self nodesWithCreationDates first created.
+	self nodesWithCreationDates do: [:node |
+		node created <= earliest ifTrue: [ earliest := node created ] ].
+	^ earliest
+]
+
 { #category : #accessing }
 GrafoscopioNode >> edited [
-	^ edited asDateAndTime
+	^ edited ifNotNil: [^ edited asDateAndTime ]
 ]
 
 { #category : #accessing }
@@ -139,6 +149,16 @@ GrafoscopioNode >> nodesInPreorder: anObject [
 	nodesInPreorder := anObject
 ]
 
+{ #category : #accessing }
+GrafoscopioNode >> nodesWithCreationDates [
+	^ self nodesInPreorder select: [ :each | each created isNotNil ]
+]
+
+{ #category : #accessing }
+GrafoscopioNode >> nodesWithEditionDates [
+	^ self nodesInPreorder select: [ :each | each edited isNotNil ]
+]
+
 { #category : #accessing }
 GrafoscopioNode >> parent [
 	^ parent
@@ -149,6 +169,16 @@ GrafoscopioNode >> parent: anObject [
 	parent := anObject
 ]
 
+{ #category : #accessing }
+GrafoscopioNode >> populateTimestamps [
+
+	(self nodesInPreorder size = self nodesWithCreationDates size
+		and: [ self nodesInPreorder size = self nodesWithEditionDates size ])
+		ifTrue: [ ^ self nodesInPreorder ].
+	^ { self nodesWithCreationDates.
+		self nodesWithEditionDates}
+]
+
 { #category : #accessing }
 GrafoscopioNode >> printOn: aStream [
 	super printOn: aStream.
diff --git a/src/MiniDocs/GrafoscopioNodeTest.class.st b/src/MiniDocs/GrafoscopioNodeTest.class.st
new file mode 100644
index 0000000..f05c0d7
--- /dev/null
+++ b/src/MiniDocs/GrafoscopioNodeTest.class.st
@@ -0,0 +1,15 @@
+Class {
+	#name : #GrafoscopioNodeTest,
+	#superclass : #TestCase,
+	#category : #MiniDocs
+}
+
+{ #category : #accessing }
+GrafoscopioNodeTest >> testEarliestCreationNode [
+	| notebook remoteNotebook offedingNodes |
+	remoteNotebook := 'https://mutabit.com/repos.fossil/documentaton/raw/a63598382?at=documentaton.ston'.
+	notebook := (STON fromString: remoteNotebook asUrl retrieveContents utf8Decoded) first parent.
+	offedingNodes := notebook nodesInPreorder select: [:node | 
+		node created isNotNil and: [node created < notebook earliestCreationDate] ].
+	self assert: offedingNodes size equals: 0
+]