# Microsoft.AspNetCore.Authentication.Cookies

``` diff
 namespace Microsoft.AspNetCore.Authentication.Cookies {
     public class CookieAuthenticationHandler : SignInAuthenticationHandler<CookieAuthenticationOptions> {
+        public CookieAuthenticationHandler(IOptionsMonitor<CookieAuthenticationOptions> options, ILoggerFactory logger, UrlEncoder encoder);
-        public CookieAuthenticationHandler(IOptionsMonitor<CookieAuthenticationOptions> options, ILoggerFactory logger, UrlEncoder encoder, ISystemClock clock);
+        [ObsoleteAttribute("ISystemClock is obsolete, use TimeProvider on AuthenticationSchemeOptions instead.")]
+        public CookieAuthenticationHandler(IOptionsMonitor<CookieAuthenticationOptions> options, ILoggerFactory logger, UrlEncoder encoder, ISystemClock clock);
     }
 }
```

