Sessions API: filter tz handling (#29676)

server/http_session_handler.go

@@ -49,11 +49,11 @@ func sessionHandler(w http.ResponseWriter, r *http.Request) {
 	filename := "session"
 	if year := r.URL.Query().Get("year"); year != "" {
 		filename += "-" + year
-		push("STRFTIME('%Y', created) LIKE ?", year)
+		push("STRFTIME('%Y', created, 'localtime') LIKE ?", year)
 
 		if month := fmt.Sprintf("%02s", r.URL.Query().Get("month")); month != "00" {
 			filename += "-" + month
-			push("STRFTIME('%m', created) LIKE ?", month)
+			push("STRFTIME('%m', created, 'localtime') LIKE ?", month)
 		}
 	}
 

server/http_session_handler_test.go

@@ -0,0 +1,39 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"github.com/evcc-io/evcc/core/session"
+	"github.com/evcc-io/evcc/server/db"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSessionHandlerTimezoneFilter(t *testing.T) {
+	t.Setenv("TZ", "Europe/Berlin")
+	loc, err := time.LoadLocation("Europe/Berlin")
+	require.NoError(t, err)
+
+	require.NoError(t, db.NewInstance("sqlite", ":memory:"))
+	require.NoError(t, db.Instance.AutoMigrate(new(session.Session)))
+
+	// 2026-05-01 00:01 CEST = 2026-04-30 22:01 UTC: local month=May, UTC month=April
+	ts := time.Date(2026, 5, 1, 0, 1, 0, 0, loc)
+	require.NoError(t, db.Instance.Create(&session.Session{
+		Created:       ts,
+		Finished:      ts.Add(time.Hour),
+		ChargedEnergy: 1.0,
+	}).Error)
+
+	req := httptest.NewRequest(http.MethodGet, "/?year=2026&month=5", nil)
+	rec := httptest.NewRecorder()
+	sessionHandler(rec, req)
+	require.Equal(t, http.StatusOK, rec.Code)
+
+	var got session.Sessions
+	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &got))
+	require.Len(t, got, 1)
+}