diff --git a/radicle-httpd/src/api/json.rs b/radicle-httpd/src/api/json.rs
index b085e23e..d3b9183d 100644
--- a/radicle-httpd/src/api/json.rs
+++ b/radicle-httpd/src/api/json.rs
@@ -139,7 +139,7 @@ pub(crate) fn patch(
                 "discussions": rev.discussion().comments()
                   .map(|(id, comment)| Comment::new(id, comment,  aliases))
                   .collect::<Vec<_>>(),
-                "timestamp": rev.timestamp().as_secs().to_string(),
+                "timestamp": rev.timestamp().as_secs(),
                 "reviews": rev.reviews().map(|(nid, _review)| review(nid, aliases.alias(nid), _review)).collect::<Vec<_>>(),
             })
         }).collect::<Vec<_>>(),
@@ -166,7 +166,7 @@ fn merge(merge: &Merge, nid: &NodeId, alias: Option<Alias>) -> Value {
                 "alias": alias,
             },
             "commit": merge.commit,
-            "timestamp": merge.timestamp.as_secs().to_string(),
+            "timestamp": merge.timestamp.as_secs(),
             "revision": merge.revision,
         }),
         None => json!({
@@ -174,7 +174,7 @@ fn merge(merge: &Merge, nid: &NodeId, alias: Option<Alias>) -> Value {
                 "id": nid,
             },
             "commit": merge.commit,
-            "timestamp": merge.timestamp.as_secs().to_string(),
+            "timestamp": merge.timestamp.as_secs(),
             "revision": merge.revision,
         }),
     }
@@ -191,7 +191,7 @@ fn review(nid: &NodeId, alias: Option<Alias>, review: &Review) -> Value {
             "verdict": review.verdict(),
             "summary": review.summary(),
             "comments": review.comments().collect::<Vec<_>>(),
-            "timestamp": review.timestamp().as_secs().to_string(),
+            "timestamp": review.timestamp().as_secs(),
         }),
         None => json!({
             "author": {
@@ -200,7 +200,7 @@ fn review(nid: &NodeId, alias: Option<Alias>, review: &Review) -> Value {
             "verdict": review.verdict(),
             "summary": review.summary(),
             "comments": review.comments().collect::<Vec<_>>(),
-            "timestamp": review.timestamp().as_secs().to_string(),
+            "timestamp": review.timestamp().as_secs(),
         }),
     }
 }
diff --git a/radicle-httpd/src/test.rs b/radicle-httpd/src/test.rs
index 5191520d..72b11e40 100644
--- a/radicle-httpd/src/test.rs
+++ b/radicle-httpd/src/test.rs
@@ -37,7 +37,7 @@ pub const ISSUE_ID: &str = "5ad77fa3f476beed9a26f49b2b3b844e61bef792";
 pub const ISSUE_DISCUSSION_ID: &str = "f1dff128a22e8183a23516dd9812e72e80914c92";
 pub const ISSUE_COMMENT_ID: &str = "845218041bf9eb8155bfa4aaa8f0c91ce18e5c13";
 pub const SESSION_ID: &str = "u9MGAkkfkMOv0uDDB2WeUHBT7HbsO2Dy";
-pub const TIMESTAMP: &str = "1671125284";
+pub const TIMESTAMP: u64 = 1671125284;
 pub const CONTRIBUTOR_RID: &str = "rad:z4XaCmN3jLSeiMvW15YTDpNbDHFhG";
 pub const CONTRIBUTOR_DID: &str = "did:key:z6Mkk7oqY4pPxhMmGEotDYsFo97vhCj85BLY1H256HrJmjN8";
 pub const CONTRIBUTOR_NID: &str = "z6Mkk7oqY4pPxhMmGEotDYsFo97vhCj85BLY1H256HrJmjN8";
@@ -97,7 +97,7 @@ fn seed_with_signer<G: Signer>(dir: &Path, profile: radicle::Profile, signer: &G
 
     let workdir = dir.join("hello-world");
 
-    env::set_var("RAD_COMMIT_TIME", TIMESTAMP);
+    env::set_var("RAD_COMMIT_TIME", TIMESTAMP.to_string());
 
     fs::create_dir_all(&workdir).unwrap();
 
diff --git a/radicle/src/serde_ext.rs b/radicle/src/serde_ext.rs
index 4157c23e..0755f4d4 100644
--- a/radicle/src/serde_ext.rs
+++ b/radicle/src/serde_ext.rs
@@ -29,22 +29,20 @@ pub mod string {
 pub mod localtime {
     pub mod time {
         use localtime::LocalTime;
-        use serde::{de, Deserialize, Deserializer, Serializer};
+        use serde::{Deserialize, Deserializer, Serializer};
 
         pub fn serialize<S>(value: &LocalTime, serializer: S) -> Result<S::Ok, S::Error>
         where
             S: Serializer,
         {
-            serializer.collect_str(&value.as_secs())
+            serializer.serialize_u64(value.as_secs())
         }
 
         pub fn deserialize<'de, D>(deserializer: D) -> Result<LocalTime, D::Error>
         where
             D: Deserializer<'de>,
         {
-            let seconds: u64 = String::deserialize(deserializer)?
-                .parse()
-                .map_err(de::Error::custom)?;
+            let seconds = u64::deserialize(deserializer)?;
 
             Ok(LocalTime::from_secs(seconds))
         }
@@ -52,22 +50,20 @@ pub mod localtime {
 
     pub mod duration {
         use localtime::LocalDuration;
-        use serde::{de, Deserialize, Deserializer, Serializer};
+        use serde::{Deserialize, Deserializer, Serializer};
 
         pub fn serialize<S>(value: &LocalDuration, serializer: S) -> Result<S::Ok, S::Error>
         where
             S: Serializer,
         {
-            serializer.collect_str(&value.as_secs())
+            serializer.serialize_u64(value.as_secs())
         }
 
         pub fn deserialize<'de, D>(deserializer: D) -> Result<LocalDuration, D::Error>
         where
             D: Deserializer<'de>,
         {
-            let seconds: u64 = String::deserialize(deserializer)?
-                .parse()
-                .map_err(de::Error::custom)?;
+            let seconds = u64::deserialize(deserializer)?;
 
             Ok(LocalDuration::from_secs(seconds))
         }