diff --git a/osu-framework b/osu-framework
index e1352a8b0b..5f3a7fe4d0 160000
--- a/osu-framework
+++ b/osu-framework
@@ -1 +1 @@
-Subproject commit e1352a8b0b5d1ba8acd9335a56c714d2ccc2f6a6
+Subproject commit 5f3a7fe4d0537820a33b817a41623b4b22a3ec59
diff --git a/osu.Game/IO/Legacy/SerializationReader.cs b/osu.Game/IO/Legacy/SerializationReader.cs
index bad143fa6c..c7ea884821 100644
--- a/osu.Game/IO/Legacy/SerializationReader.cs
+++ b/osu.Game/IO/Legacy/SerializationReader.cs
@@ -49,7 +49,7 @@ namespace osu.Game.IO.Legacy
             int len = ReadInt32();
             if (len > 0) return ReadBytes(len);
             if (len < 0) return null;
-            return new byte[0];
+            return Array.Empty<byte>();
         }
 
         /// <summary> Reads a char array from the buffer, handling nulls and the array length. </summary>
@@ -58,7 +58,7 @@ namespace osu.Game.IO.Legacy
             int len = ReadInt32();
             if (len > 0) return ReadChars(len);
             if (len < 0) return null;
-            return new char[0];
+            return Array.Empty<char>();
         }
 
         /// <summary> Reads a DateTime from the buffer. </summary>
diff --git a/osu.Game/Online/API/APIRequest.cs b/osu.Game/Online/API/APIRequest.cs
index 307afb2d2b..37903f924f 100644
--- a/osu.Game/Online/API/APIRequest.cs
+++ b/osu.Game/Online/API/APIRequest.cs
@@ -2,7 +2,6 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
-using osu.Framework.Extensions;
 using osu.Framework.IO.Network;
 
 namespace osu.Game.Online.API
@@ -70,13 +69,11 @@ namespace osu.Game.Online.API
 
         protected virtual string Uri => $@"{API.Endpoint}/api/v2/{Target}";
 
-        private double remainingTime => Math.Max(0, Timeout - (DateTime.Now.TotalMilliseconds() - (startTime ?? 0)));
+        private double remainingTime => Math.Max(0, Timeout - (DateTimeOffset.UtcNow - (startTime ?? DateTimeOffset.MinValue)).TotalMilliseconds);
 
         public bool ExceededTimeout => remainingTime == 0;
 
-        private double? startTime;
-
-        public double StartTime => startTime ?? -1;
+        private DateTimeOffset? startTime;
 
         protected APIAccess API;
         protected WebRequest WebRequest;
@@ -96,7 +93,7 @@ namespace osu.Game.Online.API
                 return;
 
             if (startTime == null)
-                startTime = DateTime.Now.TotalMilliseconds();
+                startTime = DateTimeOffset.UtcNow;
 
             if (remainingTime <= 0)
                 throw new TimeoutException(@"API request timeout hit");
diff --git a/osu.Game/Online/API/OAuthToken.cs b/osu.Game/Online/API/OAuthToken.cs
index 1788adbf56..2abd7b6c1f 100644
--- a/osu.Game/Online/API/OAuthToken.cs
+++ b/osu.Game/Online/API/OAuthToken.cs
@@ -4,7 +4,6 @@
 using System;
 using System.Globalization;
 using Newtonsoft.Json;
-using osu.Framework.Extensions;
 
 namespace osu.Game.Online.API
 {
@@ -22,12 +21,12 @@ namespace osu.Game.Online.API
         {
             get
             {
-                return AccessTokenExpiry - DateTime.Now.ToUnixTimestamp();
+                return AccessTokenExpiry - DateTimeOffset.UtcNow.ToUnixTimeSeconds();
             }
 
             set
             {
-                AccessTokenExpiry = DateTime.Now.AddSeconds(value).ToUnixTimestamp();
+                AccessTokenExpiry = DateTimeOffset.Now.AddSeconds(value).ToUnixTimeSeconds();
             }
         }
 
diff --git a/osu.Game/Overlays/Mods/ModButton.cs b/osu.Game/Overlays/Mods/ModButton.cs
index 3ca4a204a5..6bfe70d873 100644
--- a/osu.Game/Overlays/Mods/ModButton.cs
+++ b/osu.Game/Overlays/Mods/ModButton.cs
@@ -127,7 +127,7 @@ namespace osu.Game.Overlays.Mods
 
                 if (mod == null)
                 {
-                    Mods = new Mod[0];
+                    Mods = Array.Empty<Mod>();
                     Alpha = 0;
                 }
                 else