2 files changed, 42 insertions, 1 deletions
diff --git a/crypto/src/util/Platform.cs b/crypto/src/util/Platform.cs
index 118c29918..78ff6cee4 100644
--- a/crypto/src/util/Platform.cs
+++ b/crypto/src/util/Platform.cs
@@ -31,11 +31,26 @@ namespace Org.BouncyCastle.Utilities
             d.Dispose();
         }
 
+        internal static int IndexOf(string source, char value)
+        {
+            return InvariantCompareInfo.IndexOf(source, value, CompareOptions.Ordinal);
+        }
+
         internal static int IndexOf(string source, string value)
         {
             return InvariantCompareInfo.IndexOf(source, value, CompareOptions.Ordinal);
         }
 
+        internal static int IndexOf(string source, char value, int startIndex)
+        {
+            return InvariantCompareInfo.IndexOf(source, value, startIndex, CompareOptions.Ordinal);
+        }
+
+        internal static int IndexOf(string source, string value, int startIndex)
+        {
+            return InvariantCompareInfo.IndexOf(source, value, startIndex, CompareOptions.Ordinal);
+        }
+
         internal static int LastIndexOf(string source, string value)
         {
             return InvariantCompareInfo.LastIndexOf(source, value, CompareOptions.Ordinal);
diff --git a/crypto/src/util/date/DateTimeUtilities.cs b/crypto/src/util/date/DateTimeUtilities.cs
index 3660e29c2..c46cde8db 100644
--- a/crypto/src/util/date/DateTimeUtilities.cs
+++ b/crypto/src/util/date/DateTimeUtilities.cs
@@ -53,5 +53,31 @@ namespace Org.BouncyCastle.Utilities.Date
 		{
 			return DateTimeToUnixMs(DateTime.UtcNow);
 		}
-	}
+
+        public static DateTime WithPrecisionCentisecond(DateTime dateTime)
+        {
+            int millisecond = dateTime.Millisecond - (dateTime.Millisecond % 10);
+            return new DateTime(dateTime.Year, dateTime.Month, dateTime.Day,
+                dateTime.Hour, dateTime.Minute, dateTime.Second, millisecond, dateTime.Kind);
+        }
+
+        public static DateTime WithPrecisionDecisecond(DateTime dateTime)
+        {
+            int millisecond = dateTime.Millisecond - (dateTime.Millisecond % 100);
+            return new DateTime(dateTime.Year, dateTime.Month, dateTime.Day,
+                dateTime.Hour, dateTime.Minute, dateTime.Second, millisecond, dateTime.Kind);
+        }
+
+        public static DateTime WithPrecisionMillisecond(DateTime dateTime)
+        {
+            return new DateTime(dateTime.Year, dateTime.Month, dateTime.Day,
+                dateTime.Hour, dateTime.Minute, dateTime.Second, dateTime.Millisecond, dateTime.Kind);
+        }
+
+        public static DateTime WithPrecisionSecond(DateTime dateTime)
+        {
+            return new DateTime(dateTime.Year, dateTime.Month, dateTime.Day,
+                dateTime.Hour, dateTime.Minute, dateTime.Second, dateTime.Kind);
+        }
+    }
 }