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;

kernel/src/Timekeeping/Time.hpp

@@ -52,6 +52,12 @@ namespace Timekeeping {
 
     void Init(uint16_t Year, uint8_t Month, uint8_t Day, uint8_t Hour, uint8_t Minute, uint8_t Second);
     int64_t GetUnixTimestamp();
+
+    // Convert a UTC calendar date to a Unix timestamp. Returns 0 for dates
+    // outside the representable range. Used by filesystem drivers that store
+    // on-disk timestamps as calendar fields (e.g. FAT32).
+    int64_t DateToUnixTimestamp(int year, int month, int day, int hour, int minute, int second);
+
     DateTime GetDateTime();
     bool SetUnixTimestamp(int64_t unixSeconds);