diff --git a/app/business/time_calc.py b/app/business/time_calc.py
index 63c4260..10a5834 100644
--- a/app/business/time_calc.py
+++ b/app/business/time_calc.py
@@ -23,3 +23,11 @@ def work_minutes_reference(day_type: str) -> int:
 
 def week_balance_minutes(actual_minutes: int, reference_minutes: int) -> int:
     return actual_minutes - reference_minutes
+
+
+def count_day_types(entries: list) -> dict[str, int]:
+    """Retourne un dict {day_type: count} pour une liste d'entrées, sans les zéros."""
+    counts: dict[str, int] = {}
+    for entry in entries:
+        counts[entry.day_type] = counts.get(entry.day_type, 0) + 1
+    return counts
diff --git a/tests/test_time_calc.py b/tests/test_time_calc.py
index 87f24c6..872df05 100644
--- a/tests/test_time_calc.py
+++ b/tests/test_time_calc.py
@@ -40,3 +40,32 @@ def test_week_balance_positive():
 
 def test_week_balance_negative():
     assert week_balance_minutes(2200, 2325) == -125
+
+
+from app.business.time_calc import count_day_types
+from app.models import WorkEntry
+from datetime import date
+
+
+def test_count_day_types_basic():
+    entries = [
+        WorkEntry(date=date(2025, 1, 2), day_type="WORK"),
+        WorkEntry(date=date(2025, 1, 3), day_type="WORK"),
+        WorkEntry(date=date(2025, 1, 6), day_type="TT"),
+        WorkEntry(date=date(2025, 1, 7), day_type="GARDE"),
+    ]
+    result = count_day_types(entries)
+    assert result == {"WORK": 2, "TT": 1, "GARDE": 1}
+
+
+def test_count_day_types_empty():
+    assert count_day_types([]) == {}
+
+
+def test_count_day_types_single_type():
+    entries = [
+        WorkEntry(date=date(2025, 2, 1), day_type="RTT"),
+        WorkEntry(date=date(2025, 2, 2), day_type="RTT"),
+    ]
+    result = count_day_types(entries)
+    assert result == {"RTT": 2}