fix(kernel), feat(Timekeeping): Rely on system OVMF firmware for emulation, Rudimentary time zone support

kernel/src/Timekeeping/Time.cpp

@@ -10,6 +10,29 @@
 using namespace Kt;
 
 void Timekeeping::Init(uint16_t Year, uint8_t Month, uint8_t Day, uint8_t Hour, uint8_t Minute, uint8_t Second) {
+    /* Hardcode CET for now */
+    TimeZone CET = {
+        "Central European Time",
+        "CET",
+        1, /* UTC+1 */
+        0,
+        false
+    };
+
+    Kt::KernelLogStream(INFO, "Timekeeping Service") << "Setting time zone to " << CET.TZLongName << " (" << CET.TZShortName << ")";
+
+    Minute = Minute + CET.MinuteOffset;
+    Hour = Hour + CET.HourOffset;
+    if (Minute >= 60) {
+        Minute -= 60;
+        Hour += 1;
+    }
+    if (Hour >= 24) {
+        Hour -= 24;
+        Day += 1;
+        /* Note: No month/day overflow handling yet */
+    }
+
     kcp::cstringstream minuteStream;
     if (Minute < 10) {
         minuteStream << "0";
@@ -33,7 +56,8 @@ void Timekeeping::Init(uint16_t Year, uint8_t Month, uint8_t Day, uint8_t Hour,
         << Hour << ":"
 
         << minuteStr << ":"
-        << secondStr;
+        << secondStr
+        << " (" << CET.TZLongName << ")";
 
 
     CString dateString = panelStr.c_str();