diff --git a/lib/microwaveprop_web/live/contact_live/show.ex b/lib/microwaveprop_web/live/contact_live/show.ex
index bd305790..f3addf76 100644
--- a/lib/microwaveprop_web/live/contact_live/show.ex
+++ b/lib/microwaveprop_web/live/contact_live/show.ex
@@ -601,6 +601,7 @@ defmodule MicrowavepropWeb.ContactLive.Show do
                 field={@edit_form[:qso_timestamp]}
                 type="datetime-local"
                 label="Timestamp (UTC)"
+                lang="en-GB"
               />
             </div>
             <div class="flex gap-2">
diff --git a/lib/microwaveprop_web/live/submit_live.ex b/lib/microwaveprop_web/live/submit_live.ex
index 7dd3d548..56b5302f 100644
--- a/lib/microwaveprop_web/live/submit_live.ex
+++ b/lib/microwaveprop_web/live/submit_live.ex
@@ -375,7 +375,7 @@ defmodule MicrowavepropWeb.SubmitLive do
           options={@mode_options}
           required
         />
-        <.input field={@form[:qso_timestamp]} type="datetime-local" label="Timestamp (UTC)" required />
+        <.input field={@form[:qso_timestamp]} type="datetime-local" label="Timestamp (UTC)" lang="en-GB" required />
       </div>
 
       <%= if @current_user do %>