Weighing: Set Date/Time of scales at startup

Elwig/App.xaml.cs

@@ -145,7 +145,13 @@ namespace Elwig {
             var list = new List<IScale>();
             foreach (var s in Config.Scales) {
                 try {
-                    list.Add(Scale.FromConfig(s));
+                    var scale = Scale.FromConfig(s);
+                    if (scale is ICommandScale cmd) {
+                        try {
+                            await cmd.SetDateAndTime(DateTime.Now);
+                        } catch { }
+                    }
+                    list.Add(scale);
                 } catch (Exception exc) {
                     list.Add(new InvalidScale(s.Id));
                     if (s.Required)

Elwig/Helpers/Weighing/WeighingResult.cs

@@ -49,7 +49,7 @@ namespace Elwig.Helpers.Weighing {
         /// <returns>&lt;[GrossWeight-TaraWeight=]NetWeight/WeighingId/Date/Time&gt;</returns>
         public override readonly string ToString() {
             var w = NetWeight != null ? (GrossWeight != null && TareWeight != null ? $"{GrossWeight}-{TareWeight}=" : "") + $"{NetWeight}kg" : "";
-            return $"<{w}/{WeighingId}/{Date:yyyy-MM-dd}/{Time:HH:mm}>";
+            return $"<{w}/{WeighingId}/{Date:yyyy-MM-dd}/{Time:HH:mm:ss}>";
         }
 
         public readonly JsonObject ToJson() {