ENH: added additional datetime support, backporting some numpy 1.7 code

Author: adamklein

.gitignore

@@ -5,7 +5,8 @@ build
 dist
 MANIFEST
 *.c
-!datetime_helper.c
+!np_datetime.c
+!np_datetime_strings.c
 *.cpp
 *.so
 *.pyd

pandas/core/datetools.py

@@ -4,6 +4,7 @@
 import sys
 import numpy as np
 import pandas._tseries as lib
+import pandas._datetime as dtlib
 
 try:
     import dateutil
@@ -24,28 +25,26 @@
 #-------------------------------------------------------------------------------
 # Boxing and unboxing
 
-# TODO: fix to use new Date boxing logic
-
 _unbox_cache = dict()
 def _dt_unbox(key):
     '''
-    Unbox datetime to datetime64
+    Unbox python datetime to datetime64
     '''
     try:
         return _unbox_cache[key]
     except KeyError:
-        _unbox_cache[key] = np.datetime64(key)
+        _unbox_cache[key] = np.datetime64(dtlib.pydt_to_i8(key))
         return _unbox_cache[key]
 
 _box_cache = dict()
 def _dt_box(key):
     '''
-    Box datetime64 to datetime
+    Box datetime64 to python datetime
     '''
     try:
         return _box_cache[key]
     except KeyError:
-        _box_cache[key] = key.astype('O')
+        _box_cache[key] = dtlib.i8_to_pydt(key.view('i8'))
         return _box_cache[key]
 
 #-------------------------------------------------------------------------------

pandas/src/datetime.pxd

@@ -22,6 +22,8 @@ cdef extern from "datetime.h":
     int PyDateTime_TIME_GET_MICROSECOND(datetime o)
     bint PyDateTime_Check(object o)
     void PyDateTime_IMPORT()
+    PyObject *PyDateTime_FromDateAndTime(int year, int month, int day, int hour,
+                                         int minute, int second, int us)
 
 cdef extern from "numpy/ndarrayobject.h":
 
@@ -55,8 +57,10 @@ cdef extern from "numpy/ndarrayobject.h":
                                           NPY_DATETIMEUNIT fr,
                                           npy_datetimestruct *result)
 
-cdef extern from "datetime_helper.h":
+cdef extern from "np_datetime.h":
 
     int convert_pydatetime_to_datetimestruct(PyObject *obj, npy_datetimestruct *out,
                                              NPY_DATETIMEUNIT *out_bestunit,
                                              int apply_tzinfo)
+
+    int is_leapyear(int64_t year)