diff --git a/notes/helloshop/time-provider.md b/notes/helloshop/time-provider.md
index 07d1550..26c396b 100644
--- a/notes/helloshop/time-provider.md
+++ b/notes/helloshop/time-provider.md
@@ -1,3 +1,57 @@
-# 在零度框架中使用 TimeProvider 服务
+# 使用 TimeProvider 服务
 
-## jie
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+System.TimeProvider 是一种时间抽象，它以 DateTimeOffset 类型的形式提供时间点。 通过使用 TimeProvider，可确保代码可测试且可预测。 TimeProvider 已在 .NET 8 中引入。
+
+## 默认实现
+
+默认情况下，TimeProvider 使用 DateTimeOffset.UtcNow 作为时间源。
+
+```csharp
+Console.WriteLine($"Local: {TimeProvider.System.GetLocalNow()}");
+Console.WriteLine($"Utc:   {TimeProvider.System.GetUtcNow()}");
+```
+
+## 自定义实现
+
+```csharp
+public class CustomTimeProvider: TimeProvider
+{
+    public override DateTimeOffset GetUtcNow() => DateTimeOffset.UtcNow.AddHours(1);
+}
+```
+
+```csharp
+builder.Services.AddSingleton(TimeProvider.System);
+```
+
+```csharp
+public class MyService
+{
+    private readonly TimeProvider _timeProvider;
+
+    public MyService(TimeProvider timeProvider)
+    {
+        _timeProvider = timeProvider;
+    }
+
+    public void DoSomething()
+    {
+        var now = _timeProvider.Now;
+        Console.WriteLine(now);
+    }
+}
+```
+
+## FakeTimeProvider 实现
+
+```powershell
+dotnet add package Microsoft.Extensions.TimeProvider.Testing
+```
+
+```csharp
+FakeTimeProvider fakeTimeProvider = new();
+fakeTimeProvider.SetUtcNow(fakeTimeProvider.GetUtcNow().AddHours(1));
+
+MyService service = new (timeProvider);
+service.DoSomething();
+```
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