Request time difference measurements explicitly

cmd/core-runtime/main.go

@@ -811,6 +811,7 @@ func main() {
 					}
 					learnedLexicon := interactiondomain.TaskLexiconFromHistory(conversationHistory)
 					searchQuery := interactiondomain.SearchQueryWithLexicon(part, learnedLexicon)
+					searchQuery = interactiondomain.TimeDifferenceResearchQuery(searchQuery)
 					searchQuery = interactiondomain.TravelResearchQuery(searchQuery, conversationHistory, now)
 					// The research capability may try its configured source and a
 					// source-recovery fallback. Its caller must leave enough budget for

modules/interaction/domain/chat.go

@@ -715,6 +715,17 @@ func IsCreativeRequest(message string) bool {
 	return isCreativeRequestTokens(tokens)
 }
 
+// TimeDifferenceResearchQuery makes the requested measurement explicit for a
+// current-data capability. It preserves the user-provided entities and does
+// not encode any particular place or time-zone relationship.
+func TimeDifferenceResearchQuery(message string) string {
+	tokens := semanticTokens(StripAssistantVocative(message))
+	if containsStemInTokens(tokens, "разниц") && containsStemInTokens(tokens, "времен", "час") && containsToken(tokens, "между") {
+		return strings.TrimSpace(StripAssistantVocative(message)) + " сколько часов"
+	}
+	return strings.TrimSpace(message)
+}
+
 // CreativeDeterministicReply intentionally has no example-specific answer
 // branches. Creative requests must retain their full meaning and go through
 // cognition; canned object or color answers hide lost attributes.

modules/interaction/domain/chat_test.go

@@ -356,6 +356,13 @@ func TestTimeDifferenceRequestIsSemantic(t *testing.T) {
 	}
 }
 
+func TestTimeDifferenceResearchQueryKeepsEntitiesAndAsksForMeasurement(t *testing.T) {
+	got := TimeDifferenceResearchQuery("какая разница во времени между Москвой и Шанхаем?")
+	if got != "какая разница во времени между Москвой и Шанхаем? сколько часов" {
+		t.Fatalf("time difference query = %q", got)
+	}
+}
+
 func TestDeterministicCandidateKeepsFirstPersonCompletedWorkAsAssertion(t *testing.T) {
 	candidate := BuildDeterministicCandidate("Я всё уже настроил.", "", time.Unix(10, 0).UnixMilli())
 	if candidate.PrimarySpeechAct != interaction.SpeechActAssertion {