changes

app/workflow_utils.py

@@ -48,6 +48,14 @@ def resolve_value(expr, context):
             return now_in_context.date()
         return date.today()
     
+    if expr == "$today_str":
+        now_val = context.get("now", datetime.now())
+        if isinstance(now_val, datetime):
+            return now_val.date().isoformat()
+        elif isinstance(now_val, date):
+            return now_val.isoformat()
+        return date.today().isoformat()
+    
     if expr == "$now_iso":
         return datetime.now().isoformat(timespec='seconds')