diff --git a/pandas/src/datetime.pxd b/pandas/src/datetime.pxd
index 2147c26768319..1147d31b7fb1d 100644
--- a/pandas/src/datetime.pxd
+++ b/pandas/src/datetime.pxd
@@ -93,7 +93,7 @@ cdef extern from "datetime/np_datetime.h":
     void pandas_datetime_to_datetimestruct(npy_datetime val,
                                            PANDAS_DATETIMEUNIT fr,
                                            pandas_datetimestruct *result)
-    int _days_per_month_table[2][12]
+    int days_per_month_table[2][12]
 
     int dayofweek(int y, int m, int d)
     int is_leapyear(int64_t year)
diff --git a/pandas/src/datetime.pyx b/pandas/src/datetime.pyx
index 6458f2f8e95a9..49ca606467382 100644
--- a/pandas/src/datetime.pyx
+++ b/pandas/src/datetime.pyx
@@ -1419,7 +1419,7 @@ def monthrange(int64_t year, int64_t month):
     if month < 1 or month > 12:
         raise ValueError("bad month number 0; must be 1-12")
 
-    days = _days_per_month_table[is_leapyear(year)][month-1]
+    days = days_per_month_table[is_leapyear(year)][month-1]
 
     return (dayofweek(year, month, 1), days)
 
diff --git a/pandas/src/datetime/np_datetime.c b/pandas/src/datetime/np_datetime.c
index ad2ffacbb49dc..527ce615917cf 100644
--- a/pandas/src/datetime/np_datetime.c
+++ b/pandas/src/datetime/np_datetime.c
@@ -36,6 +36,11 @@
   #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
 #endif
 
+const int days_per_month_table[2][12] = {
+    { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
+    { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
+};
+
 /*
  * Returns 1 if the given year is a leap year, 0 otherwise.
  */
@@ -52,7 +57,7 @@ int is_leapyear(npy_int64 year)
 int dayofweek(int y, int m, int d)
 {
     int day;
-    static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
+    static const int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
     y -= m < 3;
     day = (y + y/4 - y/100 + y/400 + t[m-1] + d) % 7;
     // convert to python day
@@ -97,12 +102,12 @@ add_minutes_to_datetimestruct(pandas_datetimestruct *dts, int minutes)
             dts->month = 12;
         }
         isleap = is_leapyear(dts->year);
-        dts->day += _days_per_month_table[isleap][dts->month-1];
+        dts->day += days_per_month_table[isleap][dts->month-1];
     }
     else if (dts->day > 28) {
         isleap = is_leapyear(dts->year);
-        if (dts->day > _days_per_month_table[isleap][dts->month-1]) {
-            dts->day -= _days_per_month_table[isleap][dts->month-1];
+        if (dts->day > days_per_month_table[isleap][dts->month-1]) {
+            dts->day -= days_per_month_table[isleap][dts->month-1];
             dts->month++;
             if (dts->month > 12) {
                 dts->year++;
@@ -120,7 +125,7 @@ get_datetimestruct_days(const pandas_datetimestruct *dts)
 {
     int i, month;
     npy_int64 year, days = 0;
-    int *month_lengths;
+    const int *month_lengths;
 
     year = dts->year - 1970;
     days = year * 365;
@@ -160,7 +165,7 @@ get_datetimestruct_days(const pandas_datetimestruct *dts)
         days += year / 400;
     }
 
-    month_lengths = _days_per_month_table[is_leapyear(dts->year)];
+    month_lengths = days_per_month_table[is_leapyear(dts->year)];
     month = dts->month - 1;
 
     /* Add the months */
@@ -250,10 +255,11 @@ add_seconds_to_datetimestruct(pandas_datetimestruct *dts, int seconds)
 static void
 set_datetimestruct_days(npy_int64 days, pandas_datetimestruct *dts)
 {
-    int *month_lengths, i;
+    const int *month_lengths;
+    int i;
 
     dts->year = days_to_yearsdays(&days);
-    month_lengths = _days_per_month_table[is_leapyear(dts->year)];
+    month_lengths = days_per_month_table[is_leapyear(dts->year)];
 
     for (i = 0; i < 12; ++i) {
         if (days < month_lengths[i]) {
@@ -348,7 +354,7 @@ convert_pydatetime_to_datetimestruct(PyObject *obj, pandas_datetimestruct *out,
     }
     isleap = is_leapyear(out->year);
     if (out->day < 1 ||
-                out->day > _days_per_month_table[isleap][out->month-1]) {
+                out->day > days_per_month_table[isleap][out->month-1]) {
         goto invalid_date;
     }
 
diff --git a/pandas/src/datetime/np_datetime.h b/pandas/src/datetime/np_datetime.h
index 281c4a56569fb..f200d3a289c06 100644
--- a/pandas/src/datetime/np_datetime.h
+++ b/pandas/src/datetime/np_datetime.h
@@ -57,10 +57,7 @@ void pandas_datetime_to_datetimestruct(npy_datetime val, PANDAS_DATETIMEUNIT fr,
 
 int dayofweek(int y, int m, int d);
 
-static int _days_per_month_table[2][12] = {
-    { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
-    { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
-};
+extern const int days_per_month_table[2][12];
 
 // stuff numpy-derived code needs in header
 // ----------------------------------------------------------------------------
diff --git a/pandas/src/datetime/np_datetime_strings.c b/pandas/src/datetime/np_datetime_strings.c
index a7b6d3b5fdfbc..77ad8533f2831 100644
--- a/pandas/src/datetime/np_datetime_strings.c
+++ b/pandas/src/datetime/np_datetime_strings.c
@@ -46,7 +46,7 @@ typedef time_t NPY_TIME_T;
 /*// linux complains.*/
 /*static void _suppress_unused_variable_warning(void)*/
 /*{*/
-/*    int x = _days_per_month_table[0][0];*/
+/*    int x = days_per_month_table[0][0];*/
 /*    x = x;*/
 
 /*    int y = _month_offset[0][0];*/
@@ -229,6 +229,7 @@ convert_datetimestruct_utc_to_local(pandas_datetimestruct *out_dts_local,
     return 0;
 }
 
+#if 0
 /*
  * Converts a datetimestruct in local time to a datetimestruct in UTC.
  *
@@ -303,6 +304,7 @@ convert_datetimestruct_local_to_utc(pandas_datetimestruct *out_dts_utc,
 
     return 0;
 }
+#endif
 
 /* int */
 /* parse_python_string(PyObject* obj, pandas_datetimestruct *dts) { */
@@ -593,7 +595,7 @@ parse_iso_8601_datetime(char *str, int len,
         out->day = 10 * (substr[0] - '0') + (substr[1] - '0');
 
         if (out->day < 1 ||
-                    out->day > _days_per_month_table[year_leap][out->month-1]) {
+                    out->day > days_per_month_table[year_leap][out->month-1]) {
             PyErr_Format(PyExc_ValueError,
                         "Day out of range in datetime string \"%s\"", str);
             goto error;
diff --git a/pandas/src/numpy_helper.h b/pandas/src/numpy_helper.h
index a643a90615c57..b61878d3a03bd 100644
--- a/pandas/src/numpy_helper.h
+++ b/pandas/src/numpy_helper.h
@@ -44,7 +44,7 @@ infer_type(PyObject* obj) {
 }
 
 PANDAS_INLINE npy_int64
-get_nat() {
+get_nat(void) {
   return NPY_MIN_INT64;
 }
 
diff --git a/pandas/src/offsets.pyx b/pandas/src/offsets.pyx
index 6874950181751..5868ca5210e33 100644
--- a/pandas/src/offsets.pyx
+++ b/pandas/src/offsets.pyx
@@ -218,7 +218,7 @@ cdef class MonthOffset(_Offset):
                 self.m -= 12
                 self.y += 1
                 self.ly = is_leapyear(self.y)
-            days += _days_per_month_table[self.ly][self.m]
+            days += days_per_month_table[self.ly][self.m]
             self.m += 1
 
         self.t += days * us_in_day
@@ -238,7 +238,7 @@ cdef class MonthOffset(_Offset):
                 self.m += 12
                 self.y -= 1
                 self.ly = is_leapyear(self.y)
-            days += _days_per_month_table[self.ly][self.m]
+            days += days_per_month_table[self.ly][self.m]
 
         self.t -= days * us_in_day
 
@@ -286,7 +286,7 @@ cdef class DayOfMonthOffset(_Offset):
         cdef:
             int64_t tmp, days
 
-        days = _days_per_month_table[self.ly][self.m]
+        days = days_per_month_table[self.ly][self.m]
         self.t += days * us_in_day
         self.dow = (self.dow + days) % 7
 
@@ -300,7 +300,7 @@ cdef class DayOfMonthOffset(_Offset):
         cdef:
             int64_t tmp, days
 
-        days = _days_per_month_table[self.ly][(self.m - 1) % 12]
+        days = days_per_month_table[self.ly][(self.m - 1) % 12]
         self.t -= days * us_in_day
         self.dow = (self.dow - days) % 7
 
diff --git a/pandas/src/period.c b/pandas/src/period.c
index 484ff42d1ea94..4e7ab44c7b150 100644
--- a/pandas/src/period.c
+++ b/pandas/src/period.c
@@ -1027,10 +1027,10 @@ npy_int64 get_period_ordinal(int year, int month, int day,
                       int hour, int minute, int second,
                       int freq)
 {
-	  npy_int64 absdays, delta;
+    npy_int64 absdays, delta;
     npy_int64 weeks, days;
-    npy_int64 adj_ordinal, ordinal, day_adj;
-    int freq_group, fmonth, mdiff, quarter;
+    npy_int64 ordinal, day_adj;
+    int freq_group, fmonth, mdiff;
     freq_group = get_freq_group(freq);
 
     if (freq == FR_SEC) {