diff --git a/Cargo.lock b/Cargo.lock
index 2ca1decb..dd4d5bcc 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4340,6 +4340,7 @@ version = "10.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e640d9b0964e9d39df633548591090ab92f7a4567bc31d3891af23471a3365c6"
 dependencies = [
+ "chrono",
  "lazy_static",
  "serde_json",
  "thiserror 2.0.12",
diff --git a/modeling-cmds/Cargo.toml b/modeling-cmds/Cargo.toml
index cfcae264..caca8cab 100644
--- a/modeling-cmds/Cargo.toml
+++ b/modeling-cmds/Cargo.toml
@@ -12,7 +12,7 @@ license = "MIT"
 
 [dependencies]
 anyhow = "1.0.97"
-chrono = "0.4.39"
+chrono = { version = "0.4.39", features = ["serde"] }
 cxx = { version = "1.0", optional = true }
 data-encoding = "2.8.0"
 enum-iterator = "2.1.0"
@@ -37,6 +37,7 @@ serde_json = { version = "1.0.139", optional = true }
 slog = { version = "2.7.0", optional = true }
 tabled = { version = "0.18", optional = true }
 ts-rs = { version = "10.1.0", optional = true, features = [
+	"chrono-impl",
     "uuid-impl",
     "no-serde-warnings",
     "serde-json-impl",
diff --git a/modeling-cmds/src/format/fbx.rs b/modeling-cmds/src/format/fbx.rs
index f1411d19..e185113e 100644
--- a/modeling-cmds/src/format/fbx.rs
+++ b/modeling-cmds/src/format/fbx.rs
@@ -1,5 +1,3 @@
-use crate::datetime::DateTimeLocal;
-
 use parse_display::{Display, FromStr};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
@@ -30,11 +28,7 @@ pub mod export {
         pub storage: Storage,
 
         /// Timestamp override.
-        ///
-        /// This is intended for local integration testing only; it is not provided as an option
-        /// in the JSON schema.
-        #[serde(skip)]
-        pub created: Option<DateTimeLocal>,
+        pub created: Option<chrono::DateTime<chrono::Utc>>,
     }
 
     impl std::fmt::Display for Options {
diff --git a/modeling-cmds/src/format/step.rs b/modeling-cmds/src/format/step.rs
index 1f6d61dc..4ce831f2 100644
--- a/modeling-cmds/src/format/step.rs
+++ b/modeling-cmds/src/format/step.rs
@@ -38,11 +38,8 @@ pub mod export {
         ///
         /// [KittyCAD co-ordinate system]: ../coord/constant.KITTYCAD.html
         pub coords: coord::System,
+
         /// Timestamp override.
-        ///
-        /// This is intended for local integration testing only; it is not provided as an option
-        /// in the JSON schema.
-        #[serde(skip)]
         pub created: Option<chrono::DateTime<chrono::Utc>>,
     }