diff --git a/Socialmetrica.package/Integer.extension/instance/periodsSince.until..st b/Socialmetrica.package/Integer.extension/instance/periodsSince.until..st
new file mode 100644
index 0000000..9f71e5d
--- /dev/null
+++ b/Socialmetrica.package/Integer.extension/instance/periodsSince.until..st
@@ -0,0 +1,11 @@
+*Socialmetrica
+periodsSince: startingDate until: endingDate
+	| endings subperiodDuration |
+	subperiodDuration := (endingDate - startingDate) / self.
+	endings := OrderedCollection new.
+	endings add: startingDate.
+	1 to: self do: [ :i | | ending |
+		ending := startingDate + (subperiodDuration * i).
+		endings add:  ending.
+	].
+	^ endings
\ No newline at end of file
diff --git a/Socialmetrica.package/Integer.extension/properties.json b/Socialmetrica.package/Integer.extension/properties.json
new file mode 100644
index 0000000..a8c2b93
--- /dev/null
+++ b/Socialmetrica.package/Integer.extension/properties.json
@@ -0,0 +1,3 @@
+{
+	"name" : "Integer"
+}
\ No newline at end of file