diff --git a/app/lib/core/utils/json.dart b/app/lib/core/utils/json.dart
index d891f94..970fd7d 100644
--- a/app/lib/core/utils/json.dart
+++ b/app/lib/core/utils/json.dart
@@ -29,7 +29,23 @@ bool asBool(Object? v) => v == true;
 DateTime? asDate(Object? v) {
   final s = asString(v);
   if (s == null || s.isEmpty) return null;
-  return DateTime.tryParse(s);
+  final parsed = DateTime.tryParse(s);
+  if (parsed == null) return null;
+  // A plain date ("2026-09-18") has no timezone of its own; `DateTime.tryParse` still
+  // tags it local, which silently shifts it by the machine's offset. Re-tag the same
+  // wall-clock fields as UTC so the date this API meant is the date callers get, on any
+  // machine — a full timestamp (already carrying "Z"/an offset) is left untouched.
+  if (parsed.isUtc) return parsed;
+  return DateTime.utc(
+    parsed.year,
+    parsed.month,
+    parsed.day,
+    parsed.hour,
+    parsed.minute,
+    parsed.second,
+    parsed.millisecond,
+    parsed.microsecond,
+  );
 }
 
 /// A list of JSON objects; anything else (including null) becomes an empty list.