diff --git a/Models/DateOnlyFrame.cs b/Models/DateOnlyFrame.cs
index abde573..4beddf8 100644
--- a/Models/DateOnlyFrame.cs
+++ b/Models/DateOnlyFrame.cs
@@ -25,8 +25,8 @@ public class DateOnlyFrame
 
     public override string ToString()
     {
-        var from = (fromDate == DateOnly.MinValue) ? "" : (fromDate.ToShortDateString());
-        var to = (toDate == DateOnly.MaxValue) ? "" : (toDate.ToShortDateString());
+        var from = (fromDate == DateOnly.MinValue) ? "" : (fromDate.ToString("yyyy-MM-dd"));
+        var to = (toDate == DateOnly.MaxValue) ? "" : (toDate.ToString("yyyy-MM-dd"));
         var hyphen = from != "" && to != "" ? "-" : "";
         return $"{from}{hyphen}{to}";
     }
diff --git a/Models/DateTimeFrame.cs b/Models/DateTimeFrame.cs
index f8cdb7b..09efea3 100644
--- a/Models/DateTimeFrame.cs
+++ b/Models/DateTimeFrame.cs
@@ -18,8 +18,8 @@ public class DateTimeFrame
 
     public override string ToString()
     {
-        var from = (FromDate == DateTime.MinValue) ? "" : ("-" + FromDate.ToShortDateString());
-        var to = (ToDate == DateTime.MaxValue) ? "" : ("-" + ToDate.ToShortDateString());
+        var from = (FromDate == DateTime.MinValue) ? "" : ("-" + FromDate.ToString("yyyy-MM-dd"));
+        var to = (ToDate == DateTime.MaxValue) ? "" : ("-" + ToDate.ToString("yyyy-MM-dd"));
         return $"{from}{to}";
     }