diff --git a/Cargo.lock b/Cargo.lock
index a57be16..20e3349 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1399,6 +1399,7 @@ name = "rdsys_backend"
 version = "0.1.0"
 dependencies = [
  "bytes",
+ "chrono",
  "crc64",
  "futures",
  "futures-util",
diff --git a/crates/rdsys-backend-api/Cargo.toml b/crates/rdsys-backend-api/Cargo.toml
index 7e8d187..eaf2b3f 100644
--- a/crates/rdsys-backend-api/Cargo.toml
+++ b/crates/rdsys-backend-api/Cargo.toml
@@ -19,3 +19,4 @@ reqwest = { version = "0.11", features = ["stream"]}
 tokio-stream = "0.1.12"
 futures = "0.3.27"
 tokio-util = "0.7.7"
+chrono = { version = "0.4.26", features = ["serde", "clock"] }
diff --git a/crates/rdsys-backend-api/src/proto.rs b/crates/rdsys-backend-api/src/proto.rs
index 4b21da1..a6c8773 100644
--- a/crates/rdsys-backend-api/src/proto.rs
+++ b/crates/rdsys-backend-api/src/proto.rs
@@ -1,6 +1,7 @@
 use serde::{Deserialize, Serialize};
 use sha1::{Digest, Sha1};
 use std::collections::HashMap;
+use chrono::{DateTime, offset::Utc};
 
 /// The body of the request for resources made to the rdsys backend
 #[derive(Serialize)]
@@ -14,6 +15,7 @@ pub struct ResourceRequest {
 pub struct Resource {
     pub r#type: String,
     pub blocked_in: HashMap<String, bool>,
+    pub last_passed: DateTime<Utc>,
     pub protocol: String,
     pub address: String,
     pub port: u16,
@@ -60,6 +62,8 @@ pub struct ResourceDiff {
 
 #[cfg(test)]
 mod tests {
+    use chrono::Utc;
+
     use super::*;
 
     #[test]
@@ -88,6 +92,7 @@ mod tests {
         let bridge = Resource {
             r#type: String::from("scramblesuit"),
             blocked_in: HashMap::new(),
+            last_passed: "2023-05-30T14:20:28Z".parse::<DateTime<Utc>>().unwrap(),
             protocol: String::from("tcp"),
             address: String::from("216.117.3.62"),
             port: 63174,
@@ -102,6 +107,7 @@ mod tests {
             {
                 "type": "scramblesuit",
                 "blocked_in": {},
+                "last_passed": "2023-05-30T14:20:28.000+00:00",
                 "protocol": "tcp",
                 "address": "216.117.3.62",
                 "port": 63174,
@@ -129,6 +135,7 @@ mod tests {
                         {
                             "type": "obfs2",
                             "blocked_in": {},
+                            "last_passed": "2023-05-30T11:42:28.000+07:00",
                             "Location": null,
                             "protocol": "tcp",
                             "address": "176.247.216.207",
@@ -146,6 +153,7 @@ mod tests {
                         {
                             "type": "obfs2",
                             "blocked_in": {},
+                            "last_passed": "2023-05-30T12:20:28.000+07:00",
                             "protocol": "tcp",
                             "address": "133.69.16.145",
                             "port": 58314,
@@ -164,6 +172,7 @@ mod tests {
                         {
                             "type": "scramblesuit",
                             "blocked_in": {},
+                            "last_passed": "2023-05-30T14:20:28.000+07:00",
                             "protocol": "tcp",
                             "address": "216.117.3.62",
                             "port": 63174,