diff --git a/ext/kv/01_db.ts b/ext/kv/01_db.ts
index 4cd8744baf..a1015d55df 100644
--- a/ext/kv/01_db.ts
+++ b/ext/kv/01_db.ts
@@ -134,11 +134,8 @@ class Kv {
     value = serializeValue(value);
 
     const checks: Deno.AtomicCheck[] = [];
-    const expireAt = typeof options?.expireIn === "number"
-      ? Date.now() + options.expireIn
-      : undefined;
     const mutations = [
-      [key, "set", value, expireAt],
+      [key, "set", value, options?.expireIn],
     ];
 
     const versionstamp = await core.opAsync(
@@ -340,7 +337,7 @@ class AtomicOperation {
       const key = mutation.key;
       let type: string;
       let value: RawValue | null;
-      let expireAt: number | undefined = undefined;
+      let expireIn: number | undefined = undefined;
       switch (mutation.type) {
         case "delete":
           type = "delete";
@@ -350,7 +347,7 @@ class AtomicOperation {
           break;
         case "set":
           if (typeof mutation.expireIn === "number") {
-            expireAt = Date.now() + mutation.expireIn;
+            expireIn = mutation.expireIn;
           }
           /* falls through */
         case "sum":
@@ -365,7 +362,7 @@ class AtomicOperation {
         default:
           throw new TypeError("Invalid mutation type");
       }
-      this.#mutations.push([key, type, value, expireAt]);
+      this.#mutations.push([key, type, value, expireIn]);
     }
     return this;
   }
@@ -390,10 +387,12 @@ class AtomicOperation {
     value: unknown,
     options?: { expireIn?: number },
   ): this {
-    const expireAt = typeof options?.expireIn === "number"
-      ? Date.now() + options.expireIn
-      : undefined;
-    this.#mutations.push([key, "set", serializeValue(value), expireAt]);
+    this.#mutations.push([
+      key,
+      "set",
+      serializeValue(value),
+      options?.expireIn,
+    ]);
     return this;
   }
 
diff --git a/ext/kv/lib.rs b/ext/kv/lib.rs
index 294f032894..dfe00ccbf5 100644
--- a/ext/kv/lib.rs
+++ b/ext/kv/lib.rs
@@ -12,6 +12,7 @@ use std::cell::RefCell;
 use std::num::NonZeroU32;
 use std::rc::Rc;
 
+use chrono::Utc;
 use codec::decode_key;
 use codec::encode_key;
 use deno_core::anyhow::Context;
@@ -383,9 +384,11 @@ impl TryFrom<V8KvCheck> for KvCheck {
 
 type V8KvMutation = (KvKey, String, Option<FromV8Value>, Option<u64>);
 
-impl TryFrom<V8KvMutation> for KvMutation {
+impl TryFrom<(V8KvMutation, u64)> for KvMutation {
   type Error = AnyError;
-  fn try_from(value: V8KvMutation) -> Result<Self, AnyError> {
+  fn try_from(
+    (value, current_timstamp): (V8KvMutation, u64),
+  ) -> Result<Self, AnyError> {
     let key = encode_v8_key(value.0)?;
     let kind = match (value.1.as_str(), value.2) {
       ("set", Some(value)) => MutationKind::Set(value.try_into()?),
@@ -405,7 +408,7 @@ impl TryFrom<V8KvMutation> for KvMutation {
     Ok(KvMutation {
       key,
       kind,
-      expire_at: value.3,
+      expire_at: value.3.map(|expire_in| current_timstamp + expire_in),
     })
   }
 }
@@ -606,6 +609,7 @@ async fn op_kv_atomic_write<DBH>(
 where
   DBH: DatabaseHandler + 'static,
 {
+  let current_timestamp = Utc::now().timestamp_millis() as u64;
   let db = {
     let state = state.borrow();
     let resource =
@@ -631,7 +635,7 @@ where
     .with_context(|| "invalid check")?;
   let mutations = mutations
     .into_iter()
-    .map(TryInto::try_into)
+    .map(|mutation| TryFrom::try_from((mutation, current_timestamp)))
     .collect::<Result<Vec<KvMutation>, AnyError>>()
     .with_context(|| "invalid mutation")?;
   let enqueues = enqueues