diff --git a/DigitalData.Core.Security/Config/StringExtensions.cs b/DigitalData.Core.Security/Config/StringExtensions.cs
index 889075f..111dfbb 100644
--- a/DigitalData.Core.Security/Config/StringExtensions.cs
+++ b/DigitalData.Core.Security/Config/StringExtensions.cs
@@ -37,20 +37,20 @@
                 var subStrings = format.Split("//");
 
                 if (subStrings.Length != 2)
-                    throw new ArgumentException("Format is invalid. It must contain exactly one '//' separator.");
+                    throw new ArgumentException($"Date tag format {format} is invalid. It must contain exactly one '//' separator.", nameof(format));
 
                 var formattedLeft = date.ToString(subStrings[0]);
 
                 if (!int.TryParse(formattedLeft, out var dateValue))
-                    throw new FormatException("The left-side value of the format could not be parsed to an integer.");
+                    throw new FormatException($"The left-side value ({formattedLeft}) of the format could not be parsed to an integer.");
 
-                if (!int.TryParse(subStrings[1], out var mode))
-                    throw new FormatException("The right-side value of the format could not be parsed to an integer.");
+                if (!int.TryParse(subStrings[1], out var divisor))
+                    throw new FormatException($"The right-side value ({divisor}) of the format could not be parsed to an integer.");
 
-                if (mode == 0)
-                    throw new DivideByZeroException("Division by zero is not allowed.");
+                if (divisor == 0)
+                    throw new DivideByZeroException($"Date tag format {format} includes division by zero, which is not allowed.");
 
-                var result = (dateValue - 1) / mode + 1;
+                var result = (dateValue - 1) / divisor + 1;
                 return result.ToString();
             }