feat: add time offset configuration

kernel/src/Api/Syscall.cpp

@@ -333,6 +333,10 @@ namespace Montauk {
                 return Sys_BtInfo((BtAdapterInfo*)frame->arg1);
             case SYS_SUSPEND:
                 return Sys_Suspend();
+            case SYS_SETTZ:
+                return Sys_SetTZ((int32_t)frame->arg1);
+            case SYS_GETTZ:
+                return Sys_GetTZ();
             default:
                 return -1;
         }

kernel/src/Api/Syscall.hpp

@@ -174,6 +174,10 @@ namespace Montauk {
     /* Power.hpp */
     static constexpr uint64_t SYS_SUSPEND      = 89;
 
+    /* Time.hpp */
+    static constexpr uint64_t SYS_SETTZ         = 90;
+    static constexpr uint64_t SYS_GETTZ         = 91;
+
     static constexpr int SOCK_TCP = 1;
     static constexpr int SOCK_UDP = 2;
 

kernel/src/Api/Time.hpp

@@ -29,4 +29,13 @@ namespace Montauk {
         out->Minute = dt.Minute;
         out->Second = dt.Second;
     }
+
+    static int64_t Sys_SetTZ(int32_t offsetMinutes) {
+        Timekeeping::SetTZOffset(offsetMinutes);
+        return 0;
+    }
+
+    static int64_t Sys_GetTZ() {
+        return (int64_t)Timekeeping::GetTZOffset();
+    }
 };