System Time Offset Implementation (#1101)

* System Time Offset Implementation

* Addressed @Thog's comments

* Addressed JD's comments

* Addressed @Thog's and @AcK77's comments

* formatting correction

1 files changed, 14 insertions, 1 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Time/Clock/Types/TimeSpanType.cs b/Ryujinx.HLE/HOS/Services/Time/Clock/Types/TimeSpanType.cs
index c336ad41..89497d82 100644
--- a/Ryujinx.HLE/HOS/Services/Time/Clock/Types/TimeSpanType.cs
+++ b/Ryujinx.HLE/HOS/Services/Time/Clock/Types/TimeSpanType.cs
@@ -1,4 +1,5 @@
-using System.Runtime.InteropServices;
+using System;
+using System.Runtime.InteropServices;
 
 namespace Ryujinx.HLE.HOS.Services.Time.Clock
 {
@@ -9,6 +10,8 @@ namespace Ryujinx.HLE.HOS.Services.Time.Clock
 
         public static readonly TimeSpanType Zero = new TimeSpanType(0);
 
+        private static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
         public long NanoSeconds;
 
         public TimeSpanType(long nanoSeconds)
@@ -21,6 +24,16 @@ namespace Ryujinx.HLE.HOS.Services.Time.Clock
             return NanoSeconds / NanoSecondsPerSecond;
         }
 
+        public TimeSpanType AddSeconds(long seconds)
+        {
+            return new TimeSpanType(NanoSeconds + (seconds * NanoSecondsPerSecond));
+        }
+
+        public bool IsDaylightSavingTime()
+        {
+            return UnixEpoch.AddSeconds(ToSeconds()).ToLocalTime().IsDaylightSavingTime();
+        }
+
         public static TimeSpanType FromSeconds(long seconds)
         {
             return new TimeSpanType(seconds * NanoSecondsPerSecond);