Implemented two edge cases to support of up to nine digit nanoseconds format. Added unit tests.

Author: ndallmeyer

src/KubernetesClient.Models/KubernetesJson.cs

@@ -40,13 +40,21 @@ private static string FormatDateTimeOffsetToSevenDigitsNanoseconds(string dateTi
                 if (nanoSecondsDelimiterIndex > -1)
                 {
                     var nanoSecondsAsString = dateTimeWithoutZ.Substring(nanoSecondsDelimiterIndex + 1);
+
+                    if (nanoSecondsAsString.Length > 9)
+                    {
+                        throw new ArgumentException("Invalid format for nanoseconds, too many digits.");
+                    }
+
                     var leadingZeroes = nanoSecondsAsString.TakeWhile(c => c == '0').Count();
                     var nanoSecondsWithoutLeadingZeroesAsString = nanoSecondsAsString.Substring(leadingZeroes);
                     sevenDigitNanoseconds = nanoSecondsAsString.Length > 7
                                                 ? nanoSecondsAsString.Substring(0, 7)
                                                 : new string('0', leadingZeroes)
-                                                    + (int.Parse(nanoSecondsWithoutLeadingZeroesAsString)
-                                                         * (int)Math.Pow(10, 7 - leadingZeroes - nanoSecondsWithoutLeadingZeroesAsString.Length));
+                                                    + (string.IsNullOrEmpty(nanoSecondsWithoutLeadingZeroesAsString)
+                                                         ? new string('0', 7 - leadingZeroes)
+                                                         : int.Parse(nanoSecondsWithoutLeadingZeroesAsString)
+                                                             * (int)Math.Pow(10, 7 - leadingZeroes - nanoSecondsWithoutLeadingZeroesAsString.Length));
                 }
 
                 return withoutNanoseconds + "." + sevenDigitNanoseconds + (isUTC ? "Z" : "");

tests/KubernetesClient.Tests/KubernetesJsonTests.cs

@@ -0,0 +1,38 @@
+using System;
+using Xunit;
+
+namespace k8s.Tests;
+
+public class KubernetesJsonTests
+{
+    private class RfcTime
+    {
+        public DateTime rfc3339 { get; set; }
+    }
+
+    [Fact]
+    public void RFC3339()
+    {
+        var json = "{\"rfc3339\":\"2009-11-10T23:00:00Z\","
+                           + "\"rfc3339\":\"2009-11-10T23:00:00.000000Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.000000000Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.123456789Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.12345678Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.1234567Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.123456Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.12345Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.1234Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.123Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.12Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.1Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.01Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.001Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.0001Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.00001Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.000001Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.0000001Z\","
+                           + "\"rfc3339\":\"2009-11-10T13:00:00.0000001\"}\r\n";
+
+        KubernetesJson.Deserialize<RfcTime>(json);
+    }
+}