diff --git a/shared/Cargo.toml b/shared/Cargo.toml
index 1e17065..87d6be6 100644
--- a/shared/Cargo.toml
+++ b/shared/Cargo.toml
@@ -14,6 +14,7 @@ atrium-repo.workspace = true
 base64.workspace = true
 bb8.workspace = true
 bb8-redis.workspace = true
+chrono.workspace = true
 hickory-resolver.workspace = true
 serde = { version = "1.0.219", features = ["derive"] }
 sqlx.workspace = true
diff --git a/shared/src/advent/challenges/day_three/repo.rs b/shared/src/advent/challenges/day_three/repo.rs
index ddeefeb..c08c57f 100644
--- a/shared/src/advent/challenges/day_three/repo.rs
+++ b/shared/src/advent/challenges/day_three/repo.rs
@@ -32,12 +32,13 @@ pub struct ChallengeRecord<'a> {
 pub async fn manufacture_car(
     collection: &Nsid,
     rkey: &RecordKey,
-    code: &str,
+    verification_code: &str,
     message: &str,
 ) -> Result<Vec<u8>, CarBuildError> {
+    let did = CHALLENGE_DID.parse().unwrap();
 
+    // set up repo
     let keypair = P256Keypair::import(&[0xAAu8; 32])?; // fake, it's ok
-    let did = CHALLENGE_DID.parse().unwrap();
     let mut mem = MemoryBlockStore::new();
     let builder = Repository::create(&mut mem, did).await?;
     let sig = keypair.sign(&builder.bytes())?;
@@ -45,9 +46,10 @@ pub async fn manufacture_car(
 
     // add record
     let key = format!("{}/{}", collection.as_str(), rkey.as_str());
+    let created_at = &chrono::Utc::now().to_rfc3339();
     let record = ChallengeRecord {
-        created_at: "asdf", // TODO generate
-        verification_code: code,
+        created_at,
+        verification_code,
         message,
     };
     let (cb, _cid) = repo.add_raw(&key, record).await?;