diff --git a/zero.Core/Utils/DateRange.cs b/zero.Core/Utils/DateRange.cs
index f289e1c5..a78eec5a 100644
--- a/zero.Core/Utils/DateRange.cs
+++ b/zero.Core/Utils/DateRange.cs
@@ -1,6 +1,4 @@
-using System;
-
-namespace zero.Utils;
+namespace zero.Utils;
 
 public class DateRange
 {
@@ -8,6 +6,7 @@ public class DateRange
 
   public DateTimeOffset? To { get; set; }
 
+  
   public bool IsWithin(DateTimeOffset date)
   {
     if (From.HasValue && date < From)
@@ -20,4 +19,22 @@ public class DateRange
     }
     return true;
   }
+
+
+  public string Format(string format)
+  {
+    if (!From.HasValue && !To.HasValue)
+    {
+      return null;
+    }
+    if (!From.HasValue && To.HasValue)
+    {
+      return "≤ " + To.Value.ToString(format);
+    }
+    if (From.HasValue && !To.HasValue)
+    {
+      return "≥ " + From.Value.ToString(format);
+    }
+    return From.Value.ToString(format) + " – " + To.Value.ToString(format);
+  }
 }
\ No newline at end of file