diff --git a/Plan/common/src/main/resources/assets/plan/web/js/graphs.js b/Plan/common/src/main/resources/assets/plan/web/js/graphs.js
index d90e122d9..238858c45 100644
--- a/Plan/common/src/main/resources/assets/plan/web/js/graphs.js
+++ b/Plan/common/src/main/resources/assets/plan/web/js/graphs.js
@@ -284,7 +284,7 @@ function punchCard(id, punchcardSeries) {
             type: 'datetime',
             dateTimeLabelFormats: {
                 hour: '%I %P',
-                day: '%H %P'
+                day: '%I %P'
             },
             tickInterval: 3600000
         },