Change all Cookie localized DateTime logic with Universal alternative

src/libraries/System.Net.Primitives/src/System/Net/Cookie.cs

@@ -63,7 +63,7 @@ public sealed class Cookie
         private bool m_secure; // Do not rename (binary serialization)
         [System.Runtime.Serialization.OptionalField]
         private bool m_httpOnly = false; // Do not rename (binary serialization)
-        private DateTime m_timeStamp = DateTime.Now; // Do not rename (binary serialization)
+        private DateTime m_timeStamp = DateTime.UtcNow; // Do not rename (binary serialization)
         private string m_value = string.Empty; // Do not rename (binary serialization)
         private int m_version; // Do not rename (binary serialization)
 
@@ -199,13 +199,13 @@ public bool Expired
         {
             get
             {
-                return (m_expires != DateTime.MinValue) && (m_expires.ToLocalTime() <= DateTime.Now);
+                return (m_expires != DateTime.MinValue) && (m_expires.ToUniversalTime() <= DateTime.UtcNow);
             }
             set
             {
                 if (value)
                 {
-                    m_expires = DateTime.Now;
+                    m_expires = DateTime.UtcNow;
                 }
             }
         }
@@ -801,7 +801,7 @@ internal void ToString(StringBuilder sb)
             }
             if (Expires != DateTime.MinValue)
             {
-                int seconds = (int)(Expires.ToLocalTime() - DateTime.Now).TotalSeconds;
+                int seconds = (int)(Expires.ToUniversalTime() - DateTime.UtcNow).TotalSeconds;
                 if (seconds < 0)
                 {
                     // This means that the cookie has already expired. Set Max-Age to 0

src/libraries/System.Net.Primitives/tests/FunctionalTests/CookieTest.cs

@@ -116,10 +116,10 @@ public static void Expired_GetSet_Success()
             Cookie c = new Cookie();
             Assert.False(c.Expired);
 
-            c.Expires = DateTime.Now.AddDays(-1);
+            c.Expires = DateTime.UtcNow.AddDays(-1);
             Assert.True(c.Expired);
 
-            c.Expires = DateTime.Now.AddDays(1);
+            c.Expires = DateTime.UtcNow.AddDays(1);
             Assert.False(c.Expired);
 
             c.Expired = true;
@@ -135,7 +135,7 @@ public static void Expires_GetSet_Success()
             Cookie c = new Cookie();
             Assert.Equal(c.Expires, DateTime.MinValue);
 
-            DateTime dt = DateTime.Now;
+            DateTime dt = DateTime.UtcNow;
             c.Expires = dt;
             Assert.Equal(dt, c.Expires);
         }
@@ -226,7 +226,8 @@ public static void Secure_GetSet_Success()
         [Fact]
         public static void Timestamp_GetSet_Success()
         {
-            DateTime dt = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, DateTime.Now.Hour, DateTime.Now.Minute, 0); //DateTime.Now changes as the test runs
+            //DateTime.UtcNow changes as the test runs
+            DateTime dt = new DateTime(DateTime.UtcNow.Year, DateTime.UtcNow.Month, DateTime.UtcNow.Day, DateTime.UtcNow.Hour, DateTime.UtcNow.Minute, 0);
             Cookie c = new Cookie();
             Assert.True(c.TimeStamp >= dt);
         }