diff --git a/src/Yavsc.Api.Test/RdvQueryApiControllerTests.cs b/src/Yavsc.Api.Test/RdvQueryApiControllerTests.cs
index fcd87f9a3..668814239 100644
--- a/src/Yavsc.Api.Test/RdvQueryApiControllerTests.cs
+++ b/src/Yavsc.Api.Test/RdvQueryApiControllerTests.cs
@@ -112,4 +112,35 @@ public sealed class RdvQueryApiControllerTests : IClassFixture<ApiWebServerFixtu
         Assert.NotNull(created);
         Assert.Equal("alice", created!.ClientId);
     }
+
+    [Fact]
+    public async Task PostQuery_accepts_local_datetime_and_persists_as_utc()
+    {
+        _fixture.ResetAndSeedRdvQueryGraph();
+        using var http = NewClient(subject: "alice");
+
+        var localEventDate = DateTime.Now.AddDays(2);
+        var createPayload = new
+        {
+            ActivityCode = "dev",
+            PerformerId = "alice",
+            Consent = true,
+            EventDate = localEventDate,
+            Location = new
+            {
+                Address = "3 rue du Test",
+                Latitude = 48.8568,
+                Longitude = 2.3524,
+            },
+            Reason = "Rendez-vous date locale",
+            Status = QueryStatus.Inserted,
+        };
+
+        var createResponse = await http.PostAsJsonAsync("/api/v1/billing/Rdv", createPayload, TestContext.Current.CancellationToken);
+        Assert.Equal(HttpStatusCode.Created, createResponse.StatusCode);
+
+        var created = await createResponse.Content.ReadFromJsonAsync<RdvQuery>(TestContext.Current.CancellationToken);
+        Assert.NotNull(created);
+        Assert.Equal(DateTimeKind.Utc, created!.EventDate.Kind);
+    }
 }
diff --git a/src/Yavsc.Api/Controllers/Business/RdvQueryApiController.cs b/src/Yavsc.Api/Controllers/Business/RdvQueryApiController.cs
index dd2982138..48e3be2e1 100644
--- a/src/Yavsc.Api/Controllers/Business/RdvQueryApiController.cs
+++ b/src/Yavsc.Api/Controllers/Business/RdvQueryApiController.cs
@@ -67,6 +67,7 @@ public class RdvQueryApiController : Controller
         var uid = User.GetUserId();
         // Security: the caller always posts for themselves.
         query.ClientId = uid;
+        query.EventDate = EnsureUtc(query.EventDate);
 
         ModelState.Remove("Client");
         ModelState.Remove("ClientId");
@@ -140,7 +141,7 @@ public class RdvQueryApiController : Controller
         existing.ActivityCode = query.ActivityCode;
         existing.PerformerId = query.PerformerId;
         existing.Consent = query.Consent;
-        existing.EventDate = query.EventDate;
+        existing.EventDate = EnsureUtc(query.EventDate);
         existing.LocationType = query.LocationType;
         existing.Reason = query.Reason;
         existing.Status = query.Status;
@@ -206,4 +207,14 @@ public class RdvQueryApiController : Controller
     {
         return _context.RdvQueries.Any(e => e.Id == id);
     }
+
+    private static DateTime EnsureUtc(DateTime value)
+    {
+        return value.Kind switch
+        {
+            DateTimeKind.Utc => value,
+            DateTimeKind.Local => value.ToUniversalTime(),
+            _ => DateTime.SpecifyKind(value, DateTimeKind.Utc)
+        };
+    }
 }