Implements CONFIG_TIME_EXTENDED as we discussed relative to providing the last 3 members of the tm struct and support for filling them in and even using the wday in the STM32 RTC. From David Sidrane.

include/nuttx/time.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/nuttx/time.h
  *
- *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2011, 2015 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -100,6 +100,26 @@ int clock_isleapyear(int year);
 
 int clock_daysbeforemonth(int month, bool leapyear);
 
+/****************************************************************************
+ * Function:  clock_dayoftheweek
+ *
+ * Description:
+ *    Get the day of the week
+ *
+ * Input Parameters:
+ *   mday  - The day of the month 1 - 31
+ *   month - The month of the year 1 - 12
+ *   year  - the year including the 1900
+ *
+ * Returned value:
+ *   Zero based day of the week 0-6, 0 = Sunday, 1 = Monday... 6 = Saturday
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_TIME_EXTENDED)
+int clock_dayoftheweek(int mday, int month, int year);
+#endif
+
 /****************************************************************************
  * Function:  clock_calendar2utc
  *

include/time.h

@@ -136,7 +136,7 @@ struct tm
   int tm_mday;    /* Day of the month (1-31) */
   int tm_mon;     /* Month (0-11) */
   int tm_year;    /* Years since 1900 */
-#ifdef CONFIG_LIBC_LOCALTIME
+#if defined(CONFIG_LIBC_LOCALTIME) || defined(CONFIG_TIME_EXTENDED)
   int tm_wday;    /* Day of the week (0-6) */
   int tm_yday;    /* Day of the year (0-365) */
   int tm_isdst;   /* Non-0 if daylight savings time is in effect */