[seahorse] util: Remove get_display_date_string()

[Niels De Graef <nielsdg src gnome org>]

commit e306bb43a1c08010543e73f7071630614fe6b8c9
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sun Aug 15 15:07:13 2021 +0200

    util: Remove get_display_date_string()
    
    There was only one use left (in gkr-keyring-properties) and that even
    did its own 0-timestamp checking. It's a tiny function, so just do it at
    the correct place.

 common/util.vala                | 8 --------
 gkr/gkr-keyring-properties.vala | 9 +++++++--
 2 files changed, 7 insertions(+), 10 deletions(-)
---
diff --git a/common/util.vala b/common/util.vala
index 533d3ffe..78706572 100644
--- a/common/util.vala
+++ b/common/util.vala
@@ -46,12 +46,4 @@ namespace Seahorse.Util {
                dialog.run();
                dialog.destroy();
        }
-
-       public string get_display_date_string (uint64 time)
-       {
-               if (time == 0)
-                       return "";
-               var created_date = new DateTime.from_unix_utc((int64) time);
-               return created_date.format("%x");
-       }
 }
diff --git a/gkr/gkr-keyring-properties.vala b/gkr/gkr-keyring-properties.vala
index e1a2c679..a7f97e5d 100644
--- a/gkr/gkr-keyring-properties.vala
+++ b/gkr/gkr-keyring-properties.vala
@@ -61,8 +61,13 @@ public class Seahorse.Gkr.KeyringProperties : Gtk.Dialog {
     }
 
     private void set_created(uint64 timestamp) {
-        this.created_label.label = (timestamp != 0)? Util.get_display_date_string((long) timestamp)
-                                                   : _("Unknown date");
+        if (timestamp == 0) {
+            this.created_label.label = _("Unknown date");
+            return;
+        }
+
+        var datetime = new DateTime.from_unix_utc((int64) timestamp);
+        this.created_label.label = datetime.format("%x");
     }
 
     [GtkCallback]