diff --git a/pttodoer/src/main.rs b/pttodoer/src/main.rs
index ef30f21..27f6afd 100644
--- a/pttodoer/src/main.rs
+++ b/pttodoer/src/main.rs
@@ -82,6 +82,7 @@ impl When {
       };
       match Cron::new(self.0.clone()) {
          Ok(x) => {
+            eprintln!("cron::new({:?}) => {:?}", self.0.clone(), x.clone());
             return x.next(now);
          },
          _ => {},