diff --git a/internal/router/dateparser.go b/internal/router/dateparser.go
index 908dfee..fe13e1b 100644
--- a/internal/router/dateparser.go
+++ b/internal/router/dateparser.go
@@ -49,6 +49,13 @@ try:
     text = re.sub(r'(\d+)\s+(?:час(?:а|ов)?\s+)?вечера\b', r'\1 pm', text, flags=re.IGNORECASE)
     text = re.sub(r'(\d+)\s+(?:час(?:а|ов)?\s+)?дня\b', r'\1 pm', text, flags=re.IGNORECASE)
     text = re.sub(r'(\d+)\s+(?:час(?:а|ов)?\s+)?ночи\b', r'\1 am', text, flags=re.IGNORECASE)
+    # A bare hour after a preposition is dropped on the floor by dateparser:
+    # "завтра в 7" resolves to tomorrow at the CURRENT clock, and "завтра в 7
+    # часов" is read as seven hours from now. Only a qualifier (already an
+    # am/pm above) or a colon makes it read the hour, so give it the colon.
+    # English "at 7" fails identically, so both prepositions are rewritten.
+    text = re.sub(r'(?<![\w:])(в|во|at)\s+([01]?\d|2[0-3])(?:\s+час(?:а|ов)?)?(?![\d:.\w])',
+                  lambda m: '%s %02d:00' % (m.group(1), int(m.group(2))), text, flags=re.IGNORECASE)
     settings = {'PREFER_DATES_FROM': 'future', 'RELATIVE_BASE': now}
     # Two-step: search_dates finds the date substring in text,
     # parse() gets the time right (search_dates mishandles AM/PM).
diff --git a/internal/router/dateparser_test.go b/internal/router/dateparser_test.go
index b5f8141..359393d 100644
--- a/internal/router/dateparser_test.go
+++ b/internal/router/dateparser_test.go
@@ -103,6 +103,53 @@ func TestPythonDateParser(t *testing.T) {
 				}
 			},
 		},
+		// A bare hour after a day word used to be dropped, and the current
+		// clock carried onto that day: at 21:12 "завтра в семь" confirmed a
+		// reminder for 21:12 tomorrow (Vikunja #551). She invented a time
+		// instead of asking, on a path that then fires.
+		{
+			name:   "ru bare hour — завтра в семь",
+			text:   "напомни мне завтра в семь позвонить маме",
+			wantOK: true,
+			checkT: func(t *testing.T, got, now time.Time) {
+				if got.Hour() != 7 || got.Minute() != 0 {
+					t.Errorf("завтра в семь: %02d:%02d, want 07:00", got.Hour(), got.Minute())
+				}
+			},
+		},
+		{
+			// "7 часов" was read as seven hours from now, which also moved the day.
+			name:   "ru bare hour — завтра в 7 часов",
+			text:   "напомни завтра в 7 часов позвонить",
+			wantOK: true,
+			checkT: func(t *testing.T, got, now time.Time) {
+				if got.Hour() != 7 || got.Minute() != 0 {
+					t.Errorf("завтра в 7 часов: %02d:%02d, want 07:00", got.Hour(), got.Minute())
+				}
+			},
+		},
+		{
+			name:   "en bare hour — tomorrow at 7",
+			text:   "remind me tomorrow at 7 to call mum",
+			wantOK: true,
+			checkT: func(t *testing.T, got, now time.Time) {
+				if got.Hour() != 7 || got.Minute() != 0 {
+					t.Errorf("tomorrow at 7: %02d:%02d, want 07:00", got.Hour(), got.Minute())
+				}
+			},
+		},
+		{
+			// The rewrite must not touch a duration: "через 2 часа" is not "в 2".
+			name:   "ru duration is untouched — через 2 часа",
+			text:   "напомни через 2 часа выпить воды",
+			wantOK: true,
+			checkT: func(t *testing.T, got, now time.Time) {
+				d := got.Sub(now)
+				if d < 110*time.Minute || d > 130*time.Minute {
+					t.Errorf("через 2 часа: got %v from now, want ~2h", d)
+				}
+			},
+		},
 		{
 			name:   "no date — напомни мне",
 			text:   "напомни мне",