diff --git a/package.json b/package.json
index 07f92cd..94001c6 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
     "@vanilla-extract/css": "^1.7.2",
     "@vanilla-extract/next-plugin": "^2.0.2",
     "@visx/scale": "^2.2.2",
+    "date-fns": "^2.29.3",
     "marked": "^4.0.18",
     "next": "12.2.5",
     "react": "18.2.0",
diff --git a/utils/elo.ts b/utils/elo.ts
index ec169a0..67bbd1f 100644
--- a/utils/elo.ts
+++ b/utils/elo.ts
@@ -14,6 +14,7 @@ type Config = {
 type Comparison = {
   entities: [string, string];
   result: number;
+  date: string;
 };
 
 /**
@@ -54,7 +55,7 @@ const calculateStats = (tournament: EloTournament) => {
   for (let entity of tournament.entities) {
     result[entity] = {
       comparisons: 0,
-      rating: initialRating
+      rating: initialRating,
     };
   }
 
diff --git a/utils/useIssues.ts b/utils/useIssues.ts
index e769fea..c20bb46 100644
--- a/utils/useIssues.ts
+++ b/utils/useIssues.ts
@@ -4,6 +4,7 @@ import { EloTournament } from "./elo";
 import getStats from "./getStats";
 import { getIssue, IssueDetail, IssueSummary } from "./linear";
 import weightedRandomPick from "./weightedRandomPick";
+import formatISO from "date-fns/formatISO";
 
 const useIssues = (
   credentials: Credentials,
@@ -60,7 +61,7 @@ const useIssues = (
     const comparisons: EloTournament["comparisons"] = JSON.parse(
       window.localStorage.getItem(localStorageKey) ?? "[]"
     );
-    comparisons.push({ entities, result });
+    comparisons.push({ entities, result, date: formatISO(new Date()) });
     window.localStorage.setItem(localStorageKey, JSON.stringify(comparisons));
   };
 
diff --git a/yarn.lock b/yarn.lock
index 26a3e3f..539dae0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -647,6 +647,11 @@ damerau-levenshtein@^1.0.8:
   resolved "https://registry.yarnpkg.com/damerau-levenshtein/-/damerau-levenshtein-1.0.8.tgz#b43d286ccbd36bc5b2f7ed41caf2d0aba1f8a6e7"
   integrity sha512-sdQSFB7+llfUcQHUQO3+B8ERRj0Oa4w9POWMI/puGtuf7gFywGmkaLCElnudfTiKZV+NvHqL0ifzdrI8Ro7ESA==
 
+date-fns@^2.29.3:
+  version "2.29.3"
+  resolved "https://registry.yarnpkg.com/date-fns/-/date-fns-2.29.3.tgz#27402d2fc67eb442b511b70bbdf98e6411cd68a8"
+  integrity sha512-dDCnyH2WnnKusqvZZ6+jA1O51Ibt8ZMRNkDZdyAyK4YfbDwa/cEmuztzG5pk6hqlp9aSBPYcjOlktquahGwGeA==
+
 debug@^2.6.9:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"