diff --git a/files/data/l10n/Calendar/en.yaml b/files/data/l10n/Calendar/en.yaml
index 6fd9c070bd..3ac92e9296 100644
--- a/files/data/l10n/Calendar/en.yaml
+++ b/files/data/l10n/Calendar/en.yaml
@@ -36,6 +36,6 @@ weekday5: "Thursday"
 weekday6: "Friday"
 weekday7: "Saturday"
 
-am: "am"
-pm: "pm"
-day: "day"
+am: "a.m."
+pm: "p.m."
+day: "Day"