From d4e66c30f16f005c16d354053725832382ac705d Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sun, 12 Apr 2015 09:01:35 -0600
Subject: ix an error in time initialization when there is not RTC and the time
 is initialized from a fixed configured value. The call to
 clock_calendar2utc() was returning the time in units of seconds.  The
 initialization logic, however, was expecting to get time in units of days.

---
 nuttx/libc/time/lib_calendar2utc.c | 28 +++++++++++++++++--------
 nuttx/libc/time/lib_mktime.c       | 42 ++++----------------------------------
 2 files changed, 23 insertions(+), 47 deletions(-)

diff --git a/nuttx/libc/time/lib_calendar2utc.c b/nuttx/libc/time/lib_calendar2utc.c
index 847d31661..4ed9f1d60 100644
--- a/nuttx/libc/time/lib_calendar2utc.c
+++ b/nuttx/libc/time/lib_calendar2utc.c
@@ -193,17 +193,27 @@ time_t clock_calendar2utc(int year, int month, int day)
 
 time_t clock_calendar2utc(int year, int month, int day)
 {
-  struct tm t;
+  time_t days;
 
-  /* mktime can (kind of) do this */
+  /* Years since epoch in units of days (ignoring leap years). */
 
-  t.tm_year = year;
-  t.tm_mon  = month;
-  t.tm_mday = day;
-  t.tm_hour = 0;
-  t.tm_min  = 0;
-  t.tm_sec  = 0;
-  return mktime(&t);
+  days = (year - 1970) * 365;
+
+  /* Add in the extra days for the leap years prior to the current year. */
+
+  days += (year - 1969) >> 2;
+
+  /* Add in the days up to the beginning of this month. */
+
+  days += (time_t)clock_daysbeforemonth(month, clock_isleapyear(year));
+
+  /* Add in the days since the beginning of this month (days are 1-based). */
+
+  days += day - 1;
+
+  /* Then convert the seconds and add in hours, minutes, and seconds */
+
+  return days;
 }
 #endif /* CONFIG_GREGORIAN_TIME */
 
diff --git a/nuttx/libc/time/lib_mktime.c b/nuttx/libc/time/lib_mktime.c
index 5a9c11163..b216c8dc3 100644
--- a/nuttx/libc/time/lib_mktime.c
+++ b/nuttx/libc/time/lib_mktime.c
@@ -77,14 +77,13 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Function:  mktime
+ * Name:  mktime
  *
  * Description:
- *  Time conversion (based on the POSIX API)
+ *   Time conversion (based on the POSIX API)
  *
  ****************************************************************************/
 
-#ifdef CONFIG_GREGORIAN_TIME
 time_t mktime(FAR struct tm *tp)
 {
   time_t ret;
@@ -94,48 +93,15 @@ time_t mktime(FAR struct tm *tp)
    * month, and date
    */
 
-  jdn = clock_calendar2utc(tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday);
+  jdn = clock_calendar2utc(tp->tm_year + 1900, tp->tm_mon, tp->tm_mday);
   sdbg("jdn=%d tm_year=%d tm_mon=%d tm_mday=%d\n",
        (int)jdn, tp->tm_year, tp->tm_mon, tp->tm_mday);
 
   /* Return the seconds into the julian day. */
 
-  ret = ((jdn*24 + tp->tm_hour)*60 + tp->tm_min)*60 + tp->tm_sec;
+  ret = ((jdn * 24 + tp->tm_hour) * 60 + tp->tm_min) * 60 + tp->tm_sec;
   sdbg("ret=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
        (int)ret, tp->tm_hour, tp->tm_min, tp->tm_sec);
 
   return ret;
 }
-#else
-
-/* Simple version that only works for dates within a (relatively) small range
- * from the epoch.  It does not handle earlier days or longer days where leap
- * seconds, etc. apply.
- */
-
-time_t mktime(FAR struct tm *tp)
-{
-  unsigned int days;
-
-  /* Years since epoch in units of days (ignoring leap years). */
-
-  days = (tp->tm_year - 70) * 365;
-
-  /* Add in the extra days for the leap years prior to the current year. */
-
-  days += (tp->tm_year - 69) >> 2;
-
-  /* Add in the days up to the beginning of this month. */
-
-  days += (time_t)clock_daysbeforemonth(tp->tm_mon, clock_isleapyear(tp->tm_year + 1900));
-
-  /* Add in the days since the beginning of this month (days are 1-based). */
-
-  days += tp->tm_mday - 1;
-
-  /* Then convert the seconds and add in hours, minutes, and seconds */
-
-  return ((days * 24 + tp->tm_hour) * 60 + tp->tm_min) * 60 + tp->tm_sec;
-}
-#endif /* CONFIG_GREGORIAN_TIME */
-
-- 
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