diff --git a/X10D/src/ConvertibleExtensions.cs b/X10D/src/ConvertibleExtensions.cs
index 51e7b97..316a293 100644
--- a/X10D/src/ConvertibleExtensions.cs
+++ b/X10D/src/ConvertibleExtensions.cs
@@ -11,46 +11,57 @@
         /// Converts the object to another type.
         /// </summary>
         /// <typeparam name="T">The type to convert to.</typeparam>
-        /// <param name="obj">The object to convert.</param>
+        /// <param name="value">The object to convert.</param>
+        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
         /// <returns>Returns the value converted to <see cref="T"/>.</returns>
-        public static T To<T>(this IConvertible obj)
+        /// <exception cref="InvalidCastException">This conversion is not supported.
+        /// -or-
+        /// <paramref name="value"/> is <see langword="null"/> and <typeparamref name="T"/> is a value type.</exception>
+        public static T To<T>(this IConvertible value, IFormatProvider provider = null)
         {
-            return (T) Convert.ChangeType(obj, typeof(T));
-        }
-
-        /// <summary>
-        /// Converts the object to another type, returning the default value on failure.
-        /// </summary>
-        /// <typeparam name="T">The type to convert to.</typeparam>
-        /// <param name="obj">The object to convert.</param>
-        /// <returns>Returns the value converted to <see cref="T"/>.</returns>
-        public static T ToOrDefault<T>(this IConvertible obj)
-        {
-            try
-            {
-                return To<T>(obj);
-            }
-            catch
+            if (value is null)
             {
                 return default;
             }
+
+            return (T)Convert.ChangeType(value, typeof(T), provider);
         }
 
         /// <summary>
         /// Converts the object to another type, returning the default value on failure.
         /// </summary>
         /// <typeparam name="T">The type to convert to.</typeparam>
-        /// <param name="obj">The object to convert.</param>
-        /// <param name="newObj">The parameter where the result should be sent.</param>
-        /// <returns>Returns <see langword="true"/> on success, <see langword="true"/> on failure.</returns>
-        public static bool ToOrDefault<T>(this IConvertible obj, out T newObj)
+        /// <param name="value">The object to convert.</param>
+        /// <param name="provider">The format provider.</param>
+        /// <returns>Returns the value converted to <see cref="T"/>.</returns>
+        /// <exception cref="InvalidCastException">This conversion is not supported.</exception>
+        public static T ToOrDefault<T>(this IConvertible value, IFormatProvider provider = null)
         {
+            return value is null ? default : To<T>(value, provider);
+        }
+
+        /// <summary>
+        /// Converts the object to another type, returning the default value on failure.
+        /// </summary>
+        /// <typeparam name="T">The type to convert to.</typeparam>
+        /// <param name="value">The object to convert.</param>
+        /// <param name="newObj">The parameter where the result should be sent.</param>
+        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
+        /// <returns>Returns <see langword="true"/> on success, <see langword="true"/> on failure.</returns>
+        public static bool ToOrDefault<T>(this IConvertible value, out T newObj, IFormatProvider provider = null)
+        {
+            if (value is null)
+            {
+                newObj = default;
+                return false;
+            }
+
             try
             {
-                newObj = To<T>(obj);
+                newObj = To<T>(value, provider);
                 return true;
             }
-            catch
+            catch (InvalidCastException)
             {
                 newObj = default;
                 return false;
@@ -61,16 +72,22 @@
         /// Converts the object to another type, returning a different value on failure.
         /// </summary>
         /// <typeparam name="T">The type to convert to.</typeparam>
-        /// <param name="obj">The object to convert.</param>
+        /// <param name="value">The object to convert.</param>
         /// <param name="other">The backup value.</param>
+        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
         /// <returns>Returns the value converted to <see cref="T"/>.</returns>
-        public static T ToOrOther<T>(this IConvertible obj, T other)
+        public static T ToOrOther<T>(this IConvertible value, T other, IFormatProvider provider = null)
         {
+            if (value is null)
+            {
+                return other;
+            }
+
             try
             {
-                return To<T>(obj);
+                return To<T>(value, provider);
             }
-            catch
+            catch (Exception ex) when (ex is InvalidCastException || ex is FormatException)
             {
                 return other;
             }
@@ -80,18 +97,25 @@
         /// Converts the object to another type, returning a different value on failure.
         /// </summary>
         /// <typeparam name="T">The type to convert to.</typeparam>
-        /// <param name="obj">The object to convert.</param>
+        /// <param name="value">The object to convert.</param>
         /// <param name="newObj">The parameter where the result should be sent.</param>
         /// <param name="other">The backup value.</param>
+        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
         /// <returns>Returns <see langword="true"/> on success, <see langword="true"/> on failure.</returns>
-        public static bool ToOrOther<T>(this IConvertible obj, out T newObj, T other)
+        public static bool ToOrOther<T>(this IConvertible value, out T newObj, T other, IFormatProvider provider = null)
         {
+            if (value is null)
+            {
+                newObj = other;
+                return false;
+            }
+
             try
             {
-                newObj = To<T>(obj);
+                newObj = To<T>(value, provider);
                 return true;
             }
-            catch
+            catch (Exception ex) when (ex is InvalidCastException || ex is FormatException)
             {
                 newObj = other;
                 return false;
@@ -102,39 +126,27 @@
         /// Converts the object to another type, returning <see langword="null"/> on failure.
         /// </summary>
         /// <typeparam name="T">The type to convert to.</typeparam>
-        /// <param name="obj">The object to convert.</param>
+        /// <param name="value">The object to convert.</param>
+        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
         /// <returns>Returns a <see cref="T"/> or <see langword="null"/>.</returns>
-        public static T ToOrNull<T>(this IConvertible obj) where T : class
+        public static T ToOrNull<T>(this IConvertible value, IFormatProvider provider = null)
+            where T : class
         {
-            try
-            {
-                return To<T>(obj);
-            }
-            catch
-            {
-                return null;
-            }
+            return value.ToOrNull(out T v, provider) ? v : null;
         }
 
         /// <summary>
         /// Converts the object to another type, returning <see langword="null"/> on failure.
         /// </summary>
         /// <typeparam name="T">The type to convert to.</typeparam>
-        /// <param name="obj">The object to convert.</param>
+        /// <param name="value">The object to convert.</param>
         /// <param name="newObj">The parameter where the result should be sent.</param>
+        /// <param name="provider">An object that supplies culture-specific formatting information.</param>
         /// <returns>Returns a <see cref="T"/> or <see langword="null"/>.</returns>
-        public static bool ToOrNull<T>(this IConvertible obj, out T newObj) where T : class
+        public static bool ToOrNull<T>(this IConvertible value, out T newObj, IFormatProvider provider = null)
+            where T : class
         {
-            try
-            {
-                newObj = To<T>(obj);
-                return true;
-            }
-            catch
-            {
-                newObj = null;
-                return false;
-            }
+            return ToOrOther(value, out newObj, null, provider);
         }
     }
 }
diff --git a/X10D/src/TimeSpanParser.cs b/X10D/src/TimeSpanParser.cs
index c8517a2..54ac8f8 100644
--- a/X10D/src/TimeSpanParser.cs
+++ b/X10D/src/TimeSpanParser.cs
@@ -11,8 +11,9 @@
         /// <see cref="TimeSpan"/>.
         /// </summary>
         /// <param name="input">The input string.</param>
+        /// <param name="provider">The format provider.</param>
         /// <returns>Returns an instance of <see cref="TimeSpan"/>.</returns>
-        public static TimeSpan Parse(string input)
+        public static TimeSpan Parse(string input, IFormatProvider provider = null)
         {
             const string realNumberPattern = @"([0-9]*\.[0-9]+|[0-9]+)";
             string pattern = $@"^(?:{realNumberPattern} *w)? *" +
@@ -27,32 +28,32 @@
 
             if (match.Groups[1].Success)
             {
-                weeks = double.Parse(match.Groups[1].Value);
+                weeks = double.Parse(match.Groups[1].Value, provider);
             }
 
             if (match.Groups[2].Success)
             {
-                days = double.Parse(match.Groups[2].Value);
+                days = double.Parse(match.Groups[2].Value, provider);
             }
 
             if (match.Groups[3].Success)
             {
-                hours = double.Parse(match.Groups[3].Value);
+                hours = double.Parse(match.Groups[3].Value, provider);
             }
 
             if (match.Groups[4].Success)
             {
-                minutes = double.Parse(match.Groups[4].Value);
+                minutes = double.Parse(match.Groups[4].Value, provider);
             }
 
             if (match.Groups[5].Success)
             {
-                seconds = double.Parse(match.Groups[5].Value);
+                seconds = double.Parse(match.Groups[5].Value, provider);
             }
 
             if (match.Groups[6].Success)
             {
-                milliseconds = double.Parse(match.Groups[6].Value);
+                milliseconds = double.Parse(match.Groups[6].Value, provider);
             }
 
             Trace.WriteLine($"Input: {input}");