diff --git a/src/langfingaz/parseMeetings.py b/src/langfingaz/parseMeetings.py
index eede3a6..8557273 100644
--- a/src/langfingaz/parseMeetings.py
+++ b/src/langfingaz/parseMeetings.py
@@ -2,7 +2,8 @@ from functools import total_ordering
 from typing import List
 from pathlib import Path
 from xml.etree import ElementTree
-from datetime import datetime
+from datetime import datetime, timedelta
+
 import logging
 
 from langfingaz import loadData
@@ -142,8 +143,9 @@ def parseMeetingsData(dataStr: str) -> List[Meeting]:
     return [Meeting(xml_meeting) for xml_meeting in xml_meetings.iter('meeting')]
 
 
-def readBbbStatiFromDir(dataDir: Path = fileUtil.getDataDir()) -> List[BbbStatus]:
+def readBbbStatiFromDir(dataDir: Path = fileUtil.getDataDir(), delta: timedelta = None) -> List[BbbStatus]:
     """
+    :arg delta: (optional) Only return BbbStatus objects in the time-range now-delta and now. Example: timedelta(days=28)
     :return: List of BbbStatus objects, sorted by date
     """
 
@@ -155,9 +157,21 @@ def readBbbStatiFromDir(dataDir: Path = fileUtil.getDataDir()) -> List[BbbStatus
             dataStr, t = loadData.loadData(file)
             meetings: List[Meeting] = parseMeetingsData(dataStr)
             bbbStati.append(BbbStatus(meetings, t))
-
     if (len(bbbStati) < 1):
         print("No bbbStatus objects were found in data directory: " + str(dataDir))
+        return []
 
     # sort by date
-    return sorted(bbbStati, key=BbbStatus.getKey)
+    bbbStati = sorted(bbbStati, key=BbbStatus.getKey)
+
+    if delta is not None and len(bbbStati) > 1:
+        # filter: take only bbbStatus objects of the last month (4 weeks)
+        #
+        # start: datetime = bbbStati[0].pointOfTime
+        # end: datetime = bbbStati[-1].pointOfTime
+        # delta: timedelta = end-start
+        end: datetime = bbbStati[-1].pointOfTime
+        monthBeforeEnd: datetime = end - delta
+        bbbStati = [bbbStatus for bbbStatus in bbbStati if bbbStatus.pointOfTime >= monthBeforeEnd]
+
+    return bbbStati
diff --git a/src/langfingaz/plotMeetings.py b/src/langfingaz/plotMeetings.py
index 1154802..d06e0f6 100644
--- a/src/langfingaz/plotMeetings.py
+++ b/src/langfingaz/plotMeetings.py
@@ -22,19 +22,10 @@ def plotMeetings(dataDir: Path = fileUtil.getDataDir()):
     plot BBB meetings of the last month
     """
 
-    bbbStati: List[BbbStatus] = parseMeetings.readBbbStatiFromDir(dataDir)
+    bbbStati: List[BbbStatus] = parseMeetings.readBbbStatiFromDir(dataDir=dataDir, delta=timedelta(days=28))
     if len(bbbStati) < 1:
         return
 
-    # filter: take only bbbStatus objects of the last month (4 weeks)
-    #
-    # start: datetime = bbbStati[0].pointOfTime
-    # end: datetime = bbbStati[-1].pointOfTime
-    # delta: timedelta = end-start
-    end: datetime = bbbStati[-1].pointOfTime
-    monthBeforeEnd: datetime = end - timedelta(days=28)
-    bbbStati = [bbbStatus for bbbStatus in bbbStati if bbbStatus.pointOfTime >= monthBeforeEnd]
-
     image: Path = doPlotMeetings(bbbStati)
     print("saved image at " + str(image))
 
diff --git a/src/langfingaz/recentModerators.py b/src/langfingaz/recentModerators.py
index 0b04283..925e5cb 100644
--- a/src/langfingaz/recentModerators.py
+++ b/src/langfingaz/recentModerators.py
@@ -27,7 +27,7 @@ def getModerators(dataDir: Path = fileUtil.getDataDir()) -> Dict[parseMeetings.U
     :return: Dict[User, count-how-often-as-moderator] sorted by User.fullName
     """
 
-    bbbStati: List[BbbStatus] = parseMeetings.readBbbStatiFromDir(dataDir)
+    bbbStati: List[BbbStatus] = parseMeetings.readBbbStatiFromDir(dataDir=dataDir, delta=timedelta(days=28))
     if len(bbbStati) < 1:
         return {}