Issue #7989: Added pure python implementation of the datetime module.

Modules/Setup.dist

@@ -170,7 +170,7 @@ _symtable symtablemodule.c
 #atexit atexitmodule.c      # Register functions to be run at interpreter-shutdown
 #_elementtree -I$(srcdir)/Modules/expat -DHAVE_EXPAT_CONFIG_H -DUSE_PYEXPAT_CAPI _elementtree.c	# elementtree accelerator
 #_pickle _pickle.c	# pickle accelerator
-#datetime datetimemodule.c	# date/time type
+#_datetime _datetimemodule.c	# datetime accelerator
 #_bisect _bisectmodule.c	# Bisection algorithms
 #_heapq _heapqmodule.c	# Heap queue algorithm
 

Modules/_datetimemodule.c

@@ -25,7 +25,7 @@
  * final result fits in a C int (this can be an issue on 64-bit boxes).
  */
 #if SIZEOF_INT < 4
-#       error "datetime.c requires that C int have at least 32 bits"
+#       error "_datetime.c requires that C int have at least 32 bits"
 #endif
 
 #define MINYEAR 1
@@ -5086,7 +5086,7 @@ static PyDateTime_CAPI CAPI = {
 
 static struct PyModuleDef datetimemodule = {
     PyModuleDef_HEAD_INIT,
-    "datetime",
+    "_datetime",
     "Fast implementation of the datetime type.",
     -1,
     module_methods,
@@ -5097,7 +5097,7 @@ static struct PyModuleDef datetimemodule = {
 };
 
 PyMODINIT_FUNC
-PyInit_datetime(void)
+PyInit__datetime(void)
 {
     PyObject *m;        /* a module object */
     PyObject *d;        /* its dict */