fix mtime on file creation

Author: ha-rvc

ports/nrf/fatfs_port.c

@@ -26,8 +26,18 @@
 
 #include "py/runtime.h"
 #include "lib/oofatfs/ff.h"
+#include "lib/timeutils/timeutils.h"
+
+extern void common_hal_rtc_get_time(timeutils_struct_time_t *tm);
+extern void struct_time_to_tm(mp_obj_t t, timeutils_struct_time_t *tm);
 
 DWORD get_fattime(void) {
-	// TODO: Implement this function. For now, fake it.
-    return ((2016 - 1980) << 25) | ((12) << 21) | ((4) << 16) | ((00) << 11) | ((18) << 5) | (23 / 2);
+#if CIRCUITPY_RTC
+    timeutils_struct_time_t tm;
+    common_hal_rtc_get_time(&tm);
+    return ((tm.tm_year - 1980) << 25) | (tm.tm_mon << 21) | (tm.tm_mday << 16) |
+           (tm.tm_hour << 11)          | (tm.tm_min << 5)  | (tm.tm_sec >> 1);
+#else
+    return ((2016 - 1980) << 25) | ((9) << 21) | ((1) << 16) | ((16) << 11) | ((43) << 5) | (35 / 2);
+#endif
 }