diff --git a/Koha/REST/V1/Patrons.pm b/Koha/REST/V1/Patrons.pm
index a43d57114b..8d298a0aab 100644
--- a/Koha/REST/V1/Patrons.pm
+++ b/Koha/REST/V1/Patrons.pm
@@ -19,6 +19,7 @@ use Modern::Perl;
 
 use Mojo::Base 'Mojolicious::Controller';
 
+use Koha::DateUtils;
 use Koha::Patrons;
 
 use Scalar::Util qw(blessed);
@@ -365,6 +366,14 @@ sub _to_model {
         $patron->{gonenoaddress} = ($patron->{gonenoaddress}) ? 1 : 0;
     }
 
+    if ( exists $patron->{lastseen} ) {
+        $patron->{lastseen} = output_pref({ dt => dt_from_string( $patron->{lastseen} ), dateformat => 'sql' });
+    }
+
+    if ( exists $patron->{updated_on} ) {
+        $patron->{updated_on} = output_pref({ dt => dt_from_string( $patron->{updated_on} ), dateformat => 'sql' });
+    }
+
     return $patron;
 }