diff --git a/CHANGES.md b/CHANGES.md
index bb02b798e0..12d4d7a2ca 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -12,6 +12,7 @@ Improvements 🙌:
 Bugfix 🐛:
  - After jump to unread, newer messages are never loaded (#1008)
  - Fix issues with FontScale switch (#69, #645)
+ - "Seen by" uses 12h time (#1378)
 
 Translations 🗣:
  -
diff --git a/vector/src/main/java/im/vector/riotx/core/date/VectorDateFormatter.kt b/vector/src/main/java/im/vector/riotx/core/date/VectorDateFormatter.kt
index 367615d765..344398b91e 100644
--- a/vector/src/main/java/im/vector/riotx/core/date/VectorDateFormatter.kt
+++ b/vector/src/main/java/im/vector/riotx/core/date/VectorDateFormatter.kt
@@ -45,11 +45,12 @@ class VectorDateFormatter @Inject constructor(private val context: Context,
         if (time == null) {
             return ""
         }
-        return DateUtils.getRelativeDateTimeString(context,
-                                                   time,
-                                                   DateUtils.DAY_IN_MILLIS,
-                                                   2 * DateUtils.DAY_IN_MILLIS,
-                                                   DateUtils.FORMAT_SHOW_WEEKDAY
+        return DateUtils.getRelativeDateTimeString(
+                context,
+                time,
+                DateUtils.DAY_IN_MILLIS,
+                2 * DateUtils.DAY_IN_MILLIS,
+                DateUtils.FORMAT_SHOW_WEEKDAY or DateUtils.FORMAT_SHOW_TIME
         ).toString()
     }
 }