diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 2bd69b5e4..8e1b41baa 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.11.20",
+    "version": "3.11.21",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/handler/homework.ts b/packages/hydrooj/src/handler/homework.ts
index 90f230559..023aef574 100644
--- a/packages/hydrooj/src/handler/homework.ts
+++ b/packages/hydrooj/src/handler/homework.ts
@@ -134,9 +134,9 @@ class HomeworkEditHandler extends Handler {
         this.response.body = {
             tdoc,
             dateBeginText: beginAt.format('YYYY-M-D'),
-            timeBeginText: beginAt.format('hh:mm'),
+            timeBeginText: beginAt.format('H:mm'),
             datePenaltyText: penaltySince.format('YYYY-M-D'),
-            timePenaltyText: penaltySince.format('hh:mm'),
+            timePenaltyText: penaltySince.format('H:mm'),
             extensionDays,
             penaltyRules: tid ? yaml.dump(tdoc.penaltyRules) : null,
             pids: tid ? tdoc.pids.join(',') : '',