diff --git a/Cargo.toml b/Cargo.toml
index 98edcd5..62f65b7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ license = "MIT"
 serde = { version = "1.0.218", features = ["derive"] }
 serde_json = { version = "1.0.139" }
 rand = { version = "0.9" }
-time = { version = "0.3.41", features = ["macros", "serde"] }
+time = { version = "0.3.41", features = ["formatting", "macros", "parsing", "serde"] }
 uuid = { version = "1.16.0", features = ["v4", "serde"] }
 [dev-dependencies]
 tempfile = { version = "3.19.1" }
diff --git a/src/user.rs b/src/user.rs
index 2b5cb22..5095618 100644
--- a/src/user.rs
+++ b/src/user.rs
@@ -21,9 +21,11 @@ pub struct User {
     #[serde(skip_serializing_if = "String::is_empty")]
     pub lastname: String,
     pub email_verified: bool,
+    #[serde(with = "time::serde::rfc3339::option")]
     pub date_created: Option<time::OffsetDateTime>,
     #[serde(skip_serializing_if = "String::is_empty")]
     pub status: String,
+    #[serde(with = "time::serde::rfc3339::option")]
     pub last_login: Option<time::OffsetDateTime>,
     #[serde(skip_serializing_if = "init::is_uuid_nil")]
     pub salt_id: uuid::Uuid,