diff --git a/Socialmetrica.package/Timespan.extension/instance/asDates.st b/Socialmetrica.package/Timespan.extension/instance/asDates.st
new file mode 100644
index 0000000..11e9fec
--- /dev/null
+++ b/Socialmetrica.package/Timespan.extension/instance/asDates.st
@@ -0,0 +1,5 @@
+*Socialmetrica
+asDates
+
+	^ {self start.
+	(self start + self duration)}
\ No newline at end of file
diff --git a/Socialmetrica.package/Week.extension/instance/asDatesString.st b/Socialmetrica.package/Timespan.extension/instance/asDatesString.st
similarity index 100%
rename from Socialmetrica.package/Week.extension/instance/asDatesString.st
rename to Socialmetrica.package/Timespan.extension/instance/asDatesString.st
diff --git a/Socialmetrica.package/Week.extension/instance/asDatesStrings.st b/Socialmetrica.package/Timespan.extension/instance/asDatesStrings.st
similarity index 100%
rename from Socialmetrica.package/Week.extension/instance/asDatesStrings.st
rename to Socialmetrica.package/Timespan.extension/instance/asDatesStrings.st
diff --git a/Socialmetrica.package/Timespan.extension/properties.json b/Socialmetrica.package/Timespan.extension/properties.json
new file mode 100644
index 0000000..97d20a4
--- /dev/null
+++ b/Socialmetrica.package/Timespan.extension/properties.json
@@ -0,0 +1,3 @@
+{
+	"name" : "Timespan"
+}
\ No newline at end of file
diff --git a/Socialmetrica.package/TweetsCollection.class/instance/splitBytimeSpansOf..st b/Socialmetrica.package/TweetsCollection.class/instance/splitBytimeSpansOf..st
new file mode 100644
index 0000000..0631b89
--- /dev/null
+++ b/Socialmetrica.package/TweetsCollection.class/instance/splitBytimeSpansOf..st
@@ -0,0 +1,11 @@
+accessing
+splitBytimeSpansOf: integerDivisions
+
+	| borders response |
+	response := OrderedDictionary new.
+	(self timeSpansOf: integerDivisions) doWithIndex: [ :span :i |
+		response
+			at: span asDatesString
+			put: (self select: [ :message | span includes: (message created asDateAndTime)])
+	].
+	^ response
\ No newline at end of file