diff --git a/Iceshrimp.Backend/Core/Federation/Cryptography/HttpSignature.cs b/Iceshrimp.Backend/Core/Federation/Cryptography/HttpSignature.cs
index 927e64c7..05e91326 100644
--- a/Iceshrimp.Backend/Core/Federation/Cryptography/HttpSignature.cs
+++ b/Iceshrimp.Backend/Core/Federation/Cryptography/HttpSignature.cs
@@ -93,7 +93,7 @@ public static class HttpSignature
 	{
 		ArgumentNullException.ThrowIfNull(request.RequestUri);
 
-		request.Headers.Date = DateTime.Now;
+		request.Headers.Date = DateTimeOffset.UtcNow;
 		request.Headers.Host = request.RequestUri.Host;
 
 		var requiredHeadersEnum = requiredHeaders.ToList();
diff --git a/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs b/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs
index 8112ad85..59bc0065 100644
--- a/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs
+++ b/Iceshrimp.Backend/Core/Federation/Cryptography/LdSignature.cs
@@ -57,7 +57,7 @@ public static class LdSignature
 	{
 		var options = new SignatureOptions
 		{
-			Created = DateTime.Now,
+			Created = DateTime.UtcNow,
 			Creator = new ASObjectBase(creator),
 			Nonce   = CryptographyHelpers.GenerateRandomHexString(16),
 			Type    = ["_:RsaSignature2017"],
diff --git a/Iceshrimp.Backend/Core/Middleware/RequestDurationMiddleware.cs b/Iceshrimp.Backend/Core/Middleware/RequestDurationMiddleware.cs
index 6c71f72c..75daa681 100644
--- a/Iceshrimp.Backend/Core/Middleware/RequestDurationMiddleware.cs
+++ b/Iceshrimp.Backend/Core/Middleware/RequestDurationMiddleware.cs
@@ -1,3 +1,4 @@
+using System.Diagnostics;
 using System.Globalization;
 
 namespace Iceshrimp.Backend.Core.Middleware;
@@ -8,10 +9,10 @@ public class RequestDurationMiddleware : IMiddleware
 	{
 		if (ctx.GetEndpoint()?.Metadata.GetMetadata<HideRequestDuration>() == null)
 		{
-			var pre = DateTime.Now;
+			var pre = Stopwatch.GetTimestamp();
 			ctx.Response.OnStarting(() =>
 			{
-				var duration = (int)(DateTime.Now - pre).TotalMilliseconds;
+				var duration = Math.Truncate(Stopwatch.GetElapsedTime(pre).TotalMilliseconds);
 				ctx.Response.Headers.Append("X-Request-Duration",
 				                            duration.ToString(CultureInfo.InvariantCulture) + " ms");
 				return Task.CompletedTask;
diff --git a/Iceshrimp.Tests/Concurrency/EventTests.cs b/Iceshrimp.Tests/Concurrency/EventTests.cs
index b6312c00..d8b614d3 100644
--- a/Iceshrimp.Tests/Concurrency/EventTests.cs
+++ b/Iceshrimp.Tests/Concurrency/EventTests.cs
@@ -1,3 +1,4 @@
+using System.Diagnostics;
 using Iceshrimp.Backend.Core.Helpers;
 
 namespace Iceshrimp.Tests.Concurrency;
@@ -9,7 +10,7 @@ public class EventTests
 	public async Task TestAsyncAutoResetEvent()
 	{
 		var autoResetEvent = new AsyncAutoResetEvent();
-		var pre            = DateTime.Now;
+		var pre            = Stopwatch.GetTimestamp();
 		var task           = autoResetEvent.WaitAsync();
 		_ = Task.Run(async () =>
 		{
@@ -17,7 +18,7 @@ public class EventTests
 			autoResetEvent.Set();
 		});
 		await task;
-		(DateTime.Now - pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
+		Stopwatch.GetElapsedTime(pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
 		autoResetEvent.Signaled.Should().BeFalse();
 	}
 
@@ -25,7 +26,7 @@ public class EventTests
 	public async Task TestAsyncAutoResetEventWithoutReset()
 	{
 		var autoResetEvent = new AsyncAutoResetEvent();
-		var pre            = DateTime.Now;
+		var pre            = Stopwatch.GetTimestamp();
 		var task           = autoResetEvent.WaitWithoutResetAsync();
 		_ = Task.Run(async () =>
 		{
@@ -33,7 +34,7 @@ public class EventTests
 			autoResetEvent.Set();
 		});
 		await task;
-		(DateTime.Now - pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
+		Stopwatch.GetElapsedTime(pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
 		autoResetEvent.Signaled.Should().BeTrue();
 	}
 
@@ -41,7 +42,7 @@ public class EventTests
 	public async Task TestAsyncAutoResetEventMulti()
 	{
 		var    autoResetEvent = new AsyncAutoResetEvent();
-		var    pre            = DateTime.Now;
+		var    pre            = Stopwatch.GetTimestamp();
 		Task[] tasks          = [autoResetEvent.WaitAsync(), autoResetEvent.WaitAsync()];
 		_ = Task.Run(async () =>
 		{
@@ -49,7 +50,7 @@ public class EventTests
 			autoResetEvent.Set();
 		});
 		await Task.WhenAll(tasks);
-		(DateTime.Now - pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
+		Stopwatch.GetElapsedTime(pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
 		autoResetEvent.Signaled.Should().BeFalse();
 	}
 
@@ -57,7 +58,7 @@ public class EventTests
 	public async Task TestAsyncAutoResetEventWithoutResetMulti()
 	{
 		var    autoResetEvent = new AsyncAutoResetEvent();
-		var    pre            = DateTime.Now;
+		var    pre            = Stopwatch.GetTimestamp();
 		Task[] tasks          = [autoResetEvent.WaitWithoutResetAsync(), autoResetEvent.WaitWithoutResetAsync()];
 		_ = Task.Run(async () =>
 		{
@@ -65,7 +66,7 @@ public class EventTests
 			autoResetEvent.Set();
 		});
 		await Task.WhenAll(tasks);
-		(DateTime.Now - pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
+		Stopwatch.GetElapsedTime(pre).Should().BeGreaterThan(TimeSpan.FromMilliseconds(45));
 		autoResetEvent.Signaled.Should().BeTrue();
 	}
 
diff --git a/Iceshrimp.Tests/Parsing/MfmTests.cs b/Iceshrimp.Tests/Parsing/MfmTests.cs
index 7ca8e6b6..974a25cb 100644
--- a/Iceshrimp.Tests/Parsing/MfmTests.cs
+++ b/Iceshrimp.Tests/Parsing/MfmTests.cs
@@ -1,3 +1,4 @@
+using System.Diagnostics;
 using Iceshrimp.Backend.Core.Helpers.LibMfm.Serialization;
 using Iceshrimp.Parsing;
 using Microsoft.FSharp.Collections;
@@ -376,10 +377,9 @@ public class MfmTests
 
 		double RunBenchmark()
 		{
-			var pre = DateTime.Now;
+			var pre = Stopwatch.GetTimestamp();
 			Mfm.parse(mfm);
-			var post = DateTime.Now;
-			var ms   = (post - pre).TotalMilliseconds;
+			var ms   = Stopwatch.GetElapsedTime(pre).TotalMilliseconds;
 			Console.WriteLine($@"Took {ms} ms");
 			return ms;
 		}