lib/view/pages/timetable/widgets/custom_workweek_calendar.dart

@@ -1169,8 +1169,23 @@ class _PeriodLayout {
     return y;
   }
 
-  double yOfDateTime(DateTime t) =>
+  double yOfDateTime(DateTime t) {
-      yOf(TimeOfDay(hour: t.hour, minute: t.minute));
+    final tMin = t.hour * 60 + t.minute + t.second / 60.0;
+    var y = 0.0;
+    for (final p in periods) {
+      final pStart = p.start.hour * 60 + p.start.minute;
+      final pEnd = p.end.hour * 60 + p.end.minute;
+      final h = _h(p);
+      if (tMin < pStart) return y;
+      if (tMin <= pEnd) {
+        final span = pEnd - pStart;
+        final ratio = span > 0 ? (tMin - pStart) / span : 0.0;
+        return y + ratio * h;
+      }
+      y += h;
+    }
+    return y;
+  }
 
   /// Period at a given y-offset. If y falls into a break, returns the next
   /// non-break period. Returns null when y is past the last period.