feat: real stat metadata across all filesystems, plus mkdir and rmdir

kernel/src/Timekeeping/Time.cpp

@@ -84,6 +84,13 @@ int64_t Timekeeping::GetUnixTimestamp() {
     return g_bootEpoch + (int64_t)(Timekeeping::GetMilliseconds() / 1000);
 }
 
+int64_t Timekeeping::DateToUnixTimestamp(int year, int month, int day,
+                                         int hour, int minute, int second) {
+    if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31) return 0;
+    if (hour < 0 || hour > 23 || minute < 0 || minute > 59 || second < 0 || second > 60) return 0;
+    return DateToEpoch(year, month, day, hour, minute, second);
+}
+
 bool Timekeeping::SetUnixTimestamp(int64_t unixSeconds) {
     if (unixSeconds < 0 || unixSeconds > 4102444799LL)
         return false;