diff --git a/datoer.py b/datoer.py
new file mode 100644
index 0000000..2f2ac8e
--- /dev/null
+++ b/datoer.py
@@ -0,0 +1,13 @@
+import sys
+import calendar
+
+year = 2024
+if len(sys.argv) > 1:
+    try:
+        year = int(sys.argv[-1])
+    except ValueError:
+        pass
+
+for month in range(1, 13):
+    last_sunday = max(week[-1] for week in calendar.monthcalendar(year, month))
+    print('{}-{}-{:2}'.format(year, calendar.month_abbr[month], last_sunday))
\ No newline at end of file