diff --git a/calendar/classes/output/humandate.php b/calendar/classes/output/humandate.php
index 295aaa93c26..3c757033d67 100644
--- a/calendar/classes/output/humandate.php
+++ b/calendar/classes/output/humandate.php
@@ -265,11 +265,23 @@ class humandate implements renderable, templatable {
     private function format_relative_date(): ?string {
         $usertimestamp = $this->get_user_date($this->datetime->getTimestamp());
         if ($usertimestamp == $this->get_user_date($this->clock->now()->getTimestamp())) {
-            $format = get_string('strftimerelativetoday', 'langconfig');
+            $format = get_string(
+                'timerelativetoday',
+                'calendar',
+                get_string('strftimedateshort', 'langconfig')
+            );
         } else if ($usertimestamp == $this->get_user_date(strtotime('yesterday', $this->clock->now()->getTimestamp()))) {
-            $format = get_string('strftimerelativeyesterday', 'langconfig');
+            $format = get_string(
+                'timerelativeyesterday',
+                'calendar',
+                get_string('strftimedateshort', 'langconfig')
+            );
         } else if ($usertimestamp == $this->get_user_date(strtotime('tomorrow', $this->clock->now()->getTimestamp()))) {
-            $format = get_string('strftimerelativetomorrow', 'langconfig');
+            $format = get_string(
+                'timerelativetomorrow',
+                'calendar',
+                get_string('strftimedateshort', 'langconfig')
+            );
         } else {
             return null;
         }
diff --git a/lang/en/calendar.php b/lang/en/calendar.php
index 694efe548bf..a68bc3e0042 100644
--- a/lang/en/calendar.php
+++ b/lang/en/calendar.php
@@ -245,6 +245,9 @@ $string['subscriptionsource'] = 'Event source: {$a}';
 $string['subscriptionupdated'] = 'The \'{$a}\' calendar subscription has been updated';
 $string['sun'] = 'Sun';
 $string['sunday'] = 'Sunday';
+$string['timerelativetoday'] = 'Today, {$a}';
+$string['timerelativetomorrow'] = 'Tomorrow, {$a}';
+$string['timerelativeyesterday'] = 'Yesterday, {$a}';
 $string['thu'] = 'Thu';
 $string['thursday'] = 'Thursday';
 $string['timeformat_12'] = '12-hour (am/pm)';
diff --git a/lang/en/langconfig.php b/lang/en/langconfig.php
index f5a099cf1f9..5b68fdd9ebc 100644
--- a/lang/en/langconfig.php
+++ b/lang/en/langconfig.php
@@ -189,9 +189,6 @@ $string['strftimemonth'] = '%B';
 $string['strftimemonthyear'] = '%B %Y';
 $string['strftimerecent'] = '%d %b, %H:%M';
 $string['strftimerecentfull'] = '%a, %d %b %Y, %I:%M %p';
-$string['strftimerelativetoday'] = 'Today, %d %B';
-$string['strftimerelativetomorrow'] = 'Tomorrow, %d %B';
-$string['strftimerelativeyesterday'] = 'Yesterday, %d %B';
 $string['strftimetime'] = '%I:%M %p';
 $string['strftimetime12'] = '%I:%M %p';
 $string['strftimetime24'] = '%H:%M';