diff --git a/internal/cmd/calendar_create_update_test.go b/internal/cmd/calendar_create_update_test.go
index ad5b5309..b9a3ac4c 100644
--- a/internal/cmd/calendar_create_update_test.go
+++ b/internal/cmd/calendar_create_update_test.go
@@ -204,8 +204,91 @@ func TestCalendarCreateCmd_RecurringOffsetTimezoneFallback(t *testing.T) {
 	if gotEvent.End == nil || gotEvent.End.TimeZone != "Etc/GMT-2" {
 		t.Fatalf("expected end timezone fallback Etc/GMT-2, got %#v", gotEvent.End)
 	}
-	if len(gotEvent.Recurrence) == 0 {
-		t.Fatalf("expected recurrence to be set")
+	if len(gotEvent.Recurrence) != 1 || gotEvent.Recurrence[0] != "FREQ=WEEKLY;BYDAY=TU,TH" {
+		t.Fatalf("unexpected recurrence payload: %#v", gotEvent.Recurrence)
+	}
+}
+
+func TestCalendarUpdateCmd_RecurrenceFillsMissingTimezone(t *testing.T) {
+	origNew := newCalendarService
+	t.Cleanup(func() { newCalendarService = origNew })
+
+	var (
+		gotPatch      calendar.Event
+		currentLoaded bool
+	)
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		path := strings.TrimPrefix(r.URL.Path, "/calendar/v3")
+		switch {
+		case r.Method == http.MethodGet && path == "/calendars/cal@example.com/events/ev":
+			currentLoaded = true
+			w.Header().Set("Content-Type", "application/json")
+			_ = json.NewEncoder(w).Encode(map[string]any{
+				"id": "ev",
+				"start": map[string]any{
+					"dateTime": "2026-03-03T20:00:00+01:00",
+				},
+				"end": map[string]any{
+					"dateTime": "2026-03-03T20:30:00+01:00",
+				},
+			})
+			return
+		case r.Method == http.MethodPatch && path == "/calendars/cal@example.com/events/ev":
+			_ = json.NewDecoder(r.Body).Decode(&gotPatch)
+			if gotPatch.Start == nil || gotPatch.End == nil ||
+				gotPatch.Start.TimeZone == "" || gotPatch.End.TimeZone == "" {
+				w.WriteHeader(http.StatusBadRequest)
+				w.Header().Set("Content-Type", "application/json")
+				_ = json.NewEncoder(w).Encode(map[string]any{
+					"error": map[string]any{
+						"code":    400,
+						"message": "Missing time zone definition for start time.",
+					},
+				})
+				return
+			}
+			w.Header().Set("Content-Type", "application/json")
+			_ = json.NewEncoder(w).Encode(map[string]any{
+				"id": "ev",
+			})
+			return
+		case r.Method == http.MethodGet && path == "/users/me/calendarList/cal@example.com":
+			w.Header().Set("Content-Type", "application/json")
+			_ = json.NewEncoder(w).Encode(map[string]any{
+				"id":       "cal@example.com",
+				"timeZone": "UTC",
+			})
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer srv.Close()
+
+	svc := newCalendarServiceFromServer(t, srv)
+	newCalendarService = func(context.Context, string) (*calendar.Service, error) { return svc, nil }
+
+	ctx := newCalendarJSONContext(t)
+
+	cmd := &CalendarUpdateCmd{}
+	if err := runKong(t, cmd, []string{
+		"cal@example.com",
+		"ev",
+		"--rrule", "RRULE:FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR",
+	}, ctx, &RootFlags{Account: "a@b.com"}); err != nil {
+		t.Fatalf("runKong: %v", err)
+	}
+
+	if !currentLoaded {
+		t.Fatalf("expected existing event fetch for recurring timezone enrichment")
+	}
+	if gotPatch.Start == nil || gotPatch.Start.TimeZone != "Etc/GMT-1" {
+		t.Fatalf("expected start timezone Etc/GMT-1, got %#v", gotPatch.Start)
+	}
+	if gotPatch.End == nil || gotPatch.End.TimeZone != "Etc/GMT-1" {
+		t.Fatalf("expected end timezone Etc/GMT-1, got %#v", gotPatch.End)
+	}
+	if len(gotPatch.Recurrence) != 1 || gotPatch.Recurrence[0] != "RRULE:FREQ=WEEKLY;BYDAY=MO,TU,WE,TH,FR" {
+		t.Fatalf("unexpected recurrence payload: %#v", gotPatch.Recurrence)
 	}
 }
 
diff --git a/internal/cmd/calendar_edit.go b/internal/cmd/calendar_edit.go
index 37c6dfc8..0cf69d73 100644
--- a/internal/cmd/calendar_edit.go
+++ b/internal/cmd/calendar_edit.go
@@ -22,7 +22,7 @@ type CalendarCreateCmd struct {
 	Location              string   `name:"location" help:"Location"`
 	Attendees             string   `name:"attendees" help:"Comma-separated attendee emails"`
 	AllDay                bool     `name:"all-day" help:"All-day event (use date-only in --from/--to)"`
-	Recurrence            []string `name:"rrule" help:"Recurrence rules (e.g., 'RRULE:FREQ=MONTHLY;BYMONTHDAY=11'). Can be repeated."`
+	Recurrence            []string `name:"rrule" help:"Recurrence rules (e.g., 'RRULE:FREQ=MONTHLY;BYMONTHDAY=11'). Can be repeated." sep:"none"`
 	Reminders             []string `name:"reminder" help:"Custom reminders as method:duration (e.g., popup:30m, email:1d). Can be repeated (max 5)."`
 	ColorId               string   `name:"event-color" help:"Event color ID (1-11). Use 'gog calendar colors' to see available colors."`
 	Visibility            string   `name:"visibility" help:"Event visibility: default, public, private, confidential"`
@@ -320,7 +320,7 @@ type CalendarUpdateCmd struct {
 	Attendees             string   `name:"attendees" help:"Comma-separated attendee emails (replaces all; set empty to clear)"`
 	AddAttendee           string   `name:"add-attendee" help:"Comma-separated attendee emails to add (preserves existing attendees)"`
 	AllDay                bool     `name:"all-day" help:"All-day event (use date-only in --from/--to)"`
-	Recurrence            []string `name:"rrule" help:"Recurrence rules (e.g., 'RRULE:FREQ=MONTHLY;BYMONTHDAY=11'). Can be repeated. Set empty to clear."`
+	Recurrence            []string `name:"rrule" help:"Recurrence rules (e.g., 'RRULE:FREQ=MONTHLY;BYMONTHDAY=11'). Can be repeated. Set empty to clear." sep:"none"`
 	Reminders             []string `name:"reminder" help:"Custom reminders as method:duration (e.g., popup:30m, email:1d). Can be repeated (max 5). Set empty to clear."`
 	ColorId               string   `name:"event-color" help:"Event color ID (1-11, or empty to clear)"`
 	Visibility            string   `name:"visibility" help:"Event visibility: default, public, private, confidential"`
@@ -379,6 +379,7 @@ func (c *CalendarUpdateCmd) Run(ctx context.Context, kctx *kong.Context, flags *
 	if err != nil {
 		return err
 	}
+	recurrenceProvided := flagProvided(kctx, "rrule")
 
 	patch, changed, err := c.buildUpdatePatch(kctx)
 	if err != nil {
@@ -442,6 +443,11 @@ func (c *CalendarUpdateCmd) Run(ctx context.Context, kctx *kong.Context, flags *
 	if err != nil {
 		return err
 	}
+	if recurrenceProvided {
+		if enrichErr := ensureRecurringPatchDateTimes(ctx, svc, calendarID, targetEventID, patch); enrichErr != nil {
+			return enrichErr
+		}
+	}
 
 	call := svc.Events.Patch(calendarID, targetEventID, patch).Context(ctx)
 	if sendUpdates != "" {
@@ -609,6 +615,83 @@ func (c *CalendarUpdateCmd) applyRecurrence(kctx *kong.Context, patch *calendar.
 	return true
 }
 
+func ensureRecurringPatchDateTimes(ctx context.Context, svc *calendar.Service, calendarID, eventID string, patch *calendar.Event) error {
+	if len(patch.Recurrence) == 0 {
+		return nil
+	}
+
+	patch.Start = normalizeRecurringPatchDateTime(patch.Start, nil)
+	patch.End = normalizeRecurringPatchDateTime(patch.End, nil)
+	if !recurringPatchDateTimeNeedsFetch(patch.Start) && !recurringPatchDateTimeNeedsFetch(patch.End) {
+		return nil
+	}
+
+	current, err := svc.Events.Get(calendarID, eventID).Context(ctx).Do()
+	if err != nil {
+		return fmt.Errorf("failed to fetch current event for recurrence timezone: %w", err)
+	}
+
+	patch.Start = normalizeRecurringPatchDateTime(patch.Start, current.Start)
+	patch.End = normalizeRecurringPatchDateTime(patch.End, current.End)
+	return nil
+}
+
+func recurringPatchDateTimeNeedsFetch(dt *calendar.EventDateTime) bool {
+	if dt == nil {
+		return true
+	}
+	if strings.TrimSpace(dt.Date) != "" {
+		return false
+	}
+	return strings.TrimSpace(dt.DateTime) == "" || strings.TrimSpace(dt.TimeZone) == ""
+}
+
+func normalizeRecurringPatchDateTime(primary, fallback *calendar.EventDateTime) *calendar.EventDateTime {
+	if primary == nil && fallback == nil {
+		return nil
+	}
+
+	var out *calendar.EventDateTime
+	if primary != nil {
+		out = cloneEventDateTime(primary)
+	} else {
+		out = cloneEventDateTime(fallback)
+	}
+	if out == nil {
+		return nil
+	}
+
+	if strings.TrimSpace(out.Date) != "" {
+		out.DateTime = ""
+		out.TimeZone = ""
+		return out
+	}
+	if strings.TrimSpace(out.DateTime) == "" && fallback != nil {
+		if strings.TrimSpace(fallback.Date) != "" {
+			return &calendar.EventDateTime{Date: fallback.Date}
+		}
+		out.DateTime = fallback.DateTime
+	}
+	if strings.TrimSpace(out.TimeZone) == "" && fallback != nil {
+		out.TimeZone = strings.TrimSpace(fallback.TimeZone)
+	}
+	if strings.TrimSpace(out.TimeZone) == "" && strings.TrimSpace(out.DateTime) != "" {
+		out.TimeZone = extractTimezone(out.DateTime)
+	}
+	return out
+}
+
+func cloneEventDateTime(in *calendar.EventDateTime) *calendar.EventDateTime {
+	if in == nil {
+		return nil
+	}
+	return &calendar.EventDateTime{
+		Date:     in.Date,
+		DateTime: in.DateTime,
+		TimeZone: in.TimeZone,
+	}
+}
+
 func (c *CalendarUpdateCmd) applyReminders(kctx *kong.Context, patch *calendar.Event) (bool, error) {
 	if !flagProvided(kctx, "reminder") {
 		return false, nil
diff --git a/internal/cmd/calendar_focus_time.go b/internal/cmd/calendar_focus_time.go
index 4c704950..9ca20a42 100644
--- a/internal/cmd/calendar_focus_time.go
+++ b/internal/cmd/calendar_focus_time.go
@@ -20,7 +20,7 @@ type CalendarFocusTimeCmd struct {
 	AutoDecline    string   `name:"auto-decline" help:"Auto-decline mode: none, all, new" default:"all"`
 	DeclineMessage string   `name:"decline-message" help:"Message for declined invitations"`
 	ChatStatus     string   `name:"chat-status" help:"Chat status: available, doNotDisturb" default:"doNotDisturb"`
-	Recurrence     []string `name:"rrule" help:"Recurrence rules. Can be repeated."`
+	Recurrence     []string `name:"rrule" help:"Recurrence rules. Can be repeated." sep:"none"`
 }
 
 func (c *CalendarFocusTimeCmd) Run(ctx context.Context, flags *RootFlags) error {