diff --git a/README.md b/README.md
index 0fe78a5..9f30617 100644
--- a/README.md
+++ b/README.md
@@ -201,12 +201,7 @@ pict-rs offers the following endpoints:
                     "width": 800,
                     "height": 800,
                     "content_type": "image/jpeg",
-                    "created_at": [
-                        2020,
-                        345,
-                        67376,
-                        394363487
-                    ]
+                    "created_at": "2022-04-08T18:33:42.957791698Z"
                 }
             },
             {
@@ -216,12 +211,7 @@ pict-rs offers the following endpoints:
                     "width": 400,
                     "height": 400,
                     "content_type": "image/jpeg",
-                    "created_at": [
-                        2020,
-                        345,
-                        67376,
-                        394363487
-                    ]
+                    "created_at": "2022-04-08T18:33:42.957791698Z"
                 }
             },
             {
@@ -231,12 +221,7 @@ pict-rs offers the following endpoints:
                     "width": 400,
                     "height": 400,
                     "content_type": "image/jpeg",
-                    "created_at": [
-                        2020,
-                        345,
-                        67376,
-                        394363487
-                    ]
+                    "created_at": "2022-04-08T18:33:42.957791698Z"
                 }
             }
         ],
@@ -280,12 +265,7 @@ pict-rs offers the following endpoints:
                         "width": 400,
                         "height": 400,
                         "content_type": "image/jpeg",
-                        "created_at": [
-                            2020,
-                            345,
-                            67376,
-                            394363487
-                        ]
+                        "created_at": "2022-04-08T18:33:42.957791698Z"
                     }
                 }
             ],
@@ -309,12 +289,7 @@ pict-rs offers the following endpoints:
         "width": 800,
         "height": 537,
         "content_type": "image/webp",
-        "created_at": [
-            2020,
-            345,
-            67376,
-            394363487
-        ]
+        "created_at": "2022-04-08T18:33:42.957791698Z"
     }
     ```
 - `GET /image/process.{ext}?src={file}&...` get a file with transformations applied.
diff --git a/src/details.rs b/src/details.rs
index 37ddc50..1fc5e27 100644
--- a/src/details.rs
+++ b/src/details.rs
@@ -1,12 +1,19 @@
 use crate::{error::Error, magick::ValidInputType, serde_str::Serde, store::Store};
 use actix_web::web;
 
+#[derive(Copy, Clone, Debug, serde::Deserialize, serde::Serialize)]
+#[serde(untagged)]
+enum MaybeHumanDate {
+    HumanDate(#[serde(with = "time::serde::rfc3339")] time::OffsetDateTime),
+    OldDate(#[serde(serialize_with = "time::serde::rfc3339::serialize")] time::OffsetDateTime),
+}
+
 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
 pub(crate) struct Details {
     width: usize,
     height: usize,
     content_type: Serde<mime::Mime>,
-    created_at: time::OffsetDateTime,
+    created_at: MaybeHumanDate,
 }
 
 impl Details {
@@ -49,7 +56,7 @@ impl Details {
             width,
             height,
             content_type: Serde::new(content_type),
-            created_at: time::OffsetDateTime::now_utc(),
+            created_at: MaybeHumanDate::HumanDate(time::OffsetDateTime::now_utc()),
         }
     }
 
@@ -61,3 +68,12 @@ impl Details {
         self.created_at.into()
     }
 }
+
+impl From<MaybeHumanDate> for std::time::SystemTime {
+    fn from(this: MaybeHumanDate) -> Self {
+        match this {
+            MaybeHumanDate::OldDate(old) => old.into(),
+            MaybeHumanDate::HumanDate(human) => human.into(),
+        }
+    }
+}