diff --git a/eodb/events/management/commands/activity.py b/eodb/events/management/commands/activity.py
new file mode 100644
index 0000000..8a747c1
--- /dev/null
+++ b/eodb/events/management/commands/activity.py
@@ -0,0 +1,62 @@
+import datetime
+import matplotlib
+import matplotlib.dates
+import matplotlib.pyplot as plt
+
+from django.core.management.base import BaseCommand
+from django.utils.dateparse import parse_date
+
+from eodb.events.models import Commit
+
+
+class Command(BaseCommand):
+    def add_arguments(self, parser):
+        parser.add_argument('--username', metavar='USERNAME')
+        parser.add_argument('--datemin', metavar='DATEMIN')
+        parser.add_argument('--datemax', metavar='DATEMAX')
+        parser.add_argument('--groupby', metavar='TIME UNIT', default='weeks',
+                            help='aggregate over weeks (default) / months / years')
+        parser.add_argument('--committime', action='store_true',
+                            help='use commit datetime instead of author datetime')
+
+    def handle(self, *args, **options):
+        filters = {'author_email__endswith': '@entrouvert.com'}
+
+        title = 'Git activity'
+
+        if options.get('username'):
+            filters['author_email__startswith'] = options['username'] + '@'
+            title += ' for %s' % options['username']
+
+        datetime_var = 'author_datetime'
+        if options.get('committime'):
+            datetime_var = 'commit_datetime'
+        if options.get('datemin'):
+            filters[datetime_var + '__gte'] = parse_date(options['datemin'])
+            title += ' from %s' % options['datemin']
+        if options.get('datemax'):
+            filters[datetime_var + '__lt'] = parse_date(options['datemax'])
+            title += ' until %s' % options['datemax']
+
+        events = {}
+        for commit in Commit.objects.filter(**filters):
+            commit_date = getattr(commit, datetime_var).date()
+            if options.get('groupby') == 'weeks':
+                graph_date = commit_date - datetime.timedelta(days=commit_date.weekday())
+            elif options.get('groupby') == 'months':
+                graph_date = commit_date.replace(day=1)
+            elif options.get('groupby') == 'years':
+                graph_date = commit_date.replace(month=1, day=1)
+
+            date = matplotlib.dates.date2num(graph_date)
+            if not date in events:
+                events[date] = 0
+            events[date] = events[date] + 1
+
+        dates = sorted(events.keys())
+        values = [events[x] for x in dates]
+
+        plt.title(title)
+        plt.plot(dates, values)
+        plt.gca().xaxis.set_major_formatter(matplotlib.dates.DateFormatter('%m/%Y'))
+        plt.show()