diff --git a/RTCSync.cli/Options/SetTimeOption.cs b/RTCSync.cli/Options/SetTimeOption.cs
index 828b49b..1ce95c7 100644
--- a/RTCSync.cli/Options/SetTimeOption.cs
+++ b/RTCSync.cli/Options/SetTimeOption.cs
@@ -53,7 +53,7 @@ public class SetTimeOption : IOption
             for (var i = 0; i < 3; i++)
             {
                 // FIXME: вызывает падение на windows 7
-                var dt = DateTime.Now;
+                var dt = WindowsTimeUtils.Now();
                 DeviceWriters.SetTime(device, dt);
             }
         }
diff --git a/RTCSync.cli/RTCSync.cli.csproj b/RTCSync.cli/RTCSync.cli.csproj
index 609d0d9..56c88c3 100644
--- a/RTCSync.cli/RTCSync.cli.csproj
+++ b/RTCSync.cli/RTCSync.cli.csproj
@@ -7,12 +7,17 @@
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
         <PublishAot>true</PublishAot>
+        <TrimMode>link</TrimMode>
+        <TrimmerSingleWarn>false</TrimmerSingleWarn>
         <InvariantGlobalization>true</InvariantGlobalization>
         <RootNamespace>RTCSync</RootNamespace>
+        <IlcOptimizationPreference>Size</IlcOptimizationPreference>
+        <IlcDisableReflection>true</IlcDisableReflection>
+        <OptimizationPreference>Speed</OptimizationPreference>
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="LibUsbDotNet" Version="3.0.224" />
+        <PackageReference Include="LibUsbDotNet" Version="3.0.224"/>
     </ItemGroup>
 
 </Project>
diff --git a/RTCSync.cli/Utils/WindowsTimeUtils.cs b/RTCSync.cli/Utils/WindowsTimeUtils.cs
index c7b35e8..d48c650 100644
--- a/RTCSync.cli/Utils/WindowsTimeUtils.cs
+++ b/RTCSync.cli/Utils/WindowsTimeUtils.cs
@@ -7,20 +7,39 @@ public abstract class WindowsTimeUtils
     // c# datetime set
     [DllImport("kernel32.dll")]
     public static extern bool SetSystemTime(ref SystemTime time);
- 
+
     [DllImport("kernel32.dll")]
     public static extern void GetSystemTime(ref SystemTime time);
- 
+
     [StructLayout(LayoutKind.Sequential)]
-    public struct SystemTime(DateTime dt)
+    public struct SystemTime
     {
-        public ushort Year = (ushort)dt.Year;
-        public ushort Month = (ushort)dt.Month;
-        public ushort DayOfWeek = (ushort)dt.DayOfWeek;
-        public ushort Day = (ushort)dt.Day;
-        public ushort Hour = (ushort)dt.Hour;
-        public ushort Minute = (ushort)dt.Minute;
-        public ushort Second = (ushort)dt.Second;
-        public ushort Milliseconds = (ushort)dt.Millisecond;
+        public ushort Year, Month, DayOfWeek, Day;
+        public ushort Hour, Minute, Second, Milliseconds;
+
+        public SystemTime() { }
+
+        public SystemTime(DateTime dt)
+        {
+            Year = (ushort)dt.Year;
+            Month = (ushort)dt.Month;
+            DayOfWeek = (ushort)dt.DayOfWeek;
+            Day = (ushort)dt.Day;
+            Hour = (ushort)dt.Hour;
+            Minute = (ushort)dt.Minute;
+            Second = (ushort)dt.Second;
+            Milliseconds = (ushort)dt.Millisecond;
+        }
+    }
+
+    // Фикс для Windows 7 SP1 без обновлений
+    // DataTime.Now использует слишком новый API
+    public static DateTime Now()
+    {
+        var st = new SystemTime();
+        GetSystemTime(ref st);
+        return new DateTime(st.Year, st.Month, st.Day,
+            st.Hour, st.Minute, st.Second, st.Milliseconds,
+            DateTimeKind.Utc).ToLocalTime();
     }
 }
\ No newline at end of file