System.Diagnostics.StopwatchPolyfills static class StopwatchPolyfills Provides downlevel polyfills for static methods on Stopwatch. Documentation Code public sealed class <G>$AD93117E3FFCAC821CE1CEBBAA8CB0C8 public static TimeSpan GetElapsedTime(long startingTimestamp) public static TimeSpan GetElapsedTime(long startingTimestamp, long endingTimestamp)