text: /*  datetime.h
   */
  #ifndef Py_LIMITED_API
  #ifndef DATETIME_H
  #define DATETIME_H
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /* Fields are packed into successive bytes, each viewed as unsigned and
   * big-endian, unless otherwise noted:
   *
   * byte offset
   *  0           year     2 bytes, 1-9999
   *  2           month    1 byte, 1-12
   *  3           day      1 byte, 1-31
   *  4           hour     1 byte, 0-23
   *  5           minute   1 byte, 0-59
   *  6           second   1 byte, 0-59
   *  7           usecond  3 bytes, 0-999999
   * 10
   */
  
  /* # of bytes for year, month, and day. */
  #define _PyDateTime_DATE_DATASIZE 4
  
  /* # of bytes for hour, minute, second, and usecond. */
  #define _PyDateTime_TIME_DATASIZE 6
  
  /* # of bytes for year, month, day, hour, minute, second, and usecond. */
  #define _PyDateTime_DATETIME_DATASIZE 10
  
  
  typedef struct
  {
      PyObject_HEAD
      Py_hash_t hashcode;         /* -1 when unknown */
      int days;                   /* -MAX_DELTA_DAYS <= days <= MAX_DELTA_DAYS */
      int seconds;                /* 0 <= seconds < 24*3600 is invariant */
      int microseconds;           /* 0 <= microseconds < 1000000 is invariant */
  } PyDateTime_Delta;
  
  typedef struct
  {
      PyObject_HEAD               /* a pure abstract base class */
  } PyDateTime_TZInfo;
  
  
  /* The datetime and time types have hashcodes, and an optional tzinfo member,
   * present if and only if hastzinfo is true.
   */
  #define _PyTZINFO_HEAD          \
      PyObject_HEAD               \
      Py_hash_t hashcode;         \
      char hastzinfo;             /* boolean flag */
  
  /* No _PyDateTime_BaseTZInfo is allocated; it's just to have something
   * convenient to cast to, when getting at the hastzinfo member of objects
   * starting with _PyTZINFO_HEAD.
   */
  typedef struct
  {
      _PyTZINFO_HEAD
  } _PyDateTime_BaseTZInfo;
  
  /* All time objects are of PyDateTime_TimeType, but that can be allocated
   * in two ways, with or without a tzinfo member.  Without is the same as
   * tzinfo == None, but consumes less memory.  _PyDateTime_BaseTime is an
   * internal struct used to allocate the right amount of space for the
   * "without" case.
   */
  #define _PyDateTime_TIMEHEAD    \
      _PyTZINFO_HEAD              \
      unsigned char data[_PyDateTime_TIME_DATASIZE];
  
  typedef struct
  {
      _PyDateTime_TIMEHEAD
  } _PyDateTime_BaseTime;         /* hastzinfo false */
  
  typedef struct
  {
      _PyDateTime_TIMEHEAD
      unsigned char fold;
      PyObject *tzinfo;
  } PyDateTime_Time;              /* hastzinfo true */
  
  
  /* All datetime objects are of PyDateTime_DateTimeType, but that can be
   * allocated in two ways too, just like for time objects above.  In addition,
   * the plain date type is a base class for datetime, so it must also have
   * a hastzinfo member (although it's unused there).
   */
  typedef struct
  {
      _PyTZINFO_HEAD
      unsigned char data[_PyDateTime_DATE_DATASIZE];
  } PyDateTime_Date;
  
  #define _PyDateTime_DATETIMEHEAD        \
      _PyTZINFO_HEAD                      \
      unsigned char data[_PyDateTime_DATETIME_DATASIZE];
  
  typedef struct
  {
      _PyDateTime_DATETIMEHEAD
  } _PyDateTime_BaseDateTime;     /* hastzinfo false */
  
  typedef struct
  {
      _PyDateTime_DATETIMEHEAD
      unsigned char fold;
      PyObject *tzinfo;
  } PyDateTime_DateTime;          /* hastzinfo true */
  
  
  /* Apply for date and datetime instances. */
  
  // o is a pointer to a time or a datetime object.
  #define _PyDateTime_HAS_TZINFO(o)  (((_PyDateTime_BaseTZInfo *)(o))->hastzinfo)
  
  #define PyDateTime_GET_YEAR(o)     ((((PyDateTime_Date*)(o))->data[0] << 8) | \
                       ((PyDateTime_Date*)(o))->data[1])
  #define PyDateTime_GET_MONTH(o)    (((PyDateTime_Date*)(o))->data[2])
  #define PyDateTime_GET_DAY(o)      (((PyDateTime_Date*)(o))->data[3])
  
  #define PyDateTime_DATE_GET_HOUR(o)        (((PyDateTime_DateTime*)(o))->data[4])
  #define PyDateTime_DATE_GET_MINUTE(o)      (((PyDateTime_DateTime*)(o))->data[5])
  #define PyDateTime_DATE_GET_SECOND(o)      (((PyDateTime_DateTime*)(o))->data[6])
  #define PyDateTime_DATE_GET_MICROSECOND(o)              \
      ((((PyDateTime_DateTime*)(o))->data[7] << 16) |       \
       (((PyDateTime_DateTime*)(o))->data[8] << 8)  |       \
        ((PyDateTime_DateTime*)(o))->data[9])
  #define PyDateTime_DATE_GET_FOLD(o)        (((PyDateTime_DateTime*)(o))->fold)
  #define PyDateTime_DATE_GET_TZINFO(o)      (_PyDateTime_HAS_TZINFO((o)) ? \
      ((PyDateTime_DateTime *)(o))->tzinfo : Py_None)
  
  /* Apply for time instances. */
  #define PyDateTime_TIME_GET_HOUR(o)        (((PyDateTime_Time*)(o))->data[0])
  #define PyDateTime_TIME_GET_MINUTE(o)      (((PyDateTime_Time*)(o))->data[1])
  #define PyDateTime_TIME_GET_SECOND(o)      (((PyDateTime_Time*)(o))->data[2])
  #define PyDateTime_TIME_GET_MICROSECOND(o)              \
      ((((PyDateTime_Time*)(o))->data[3] << 16) |           \
       (((PyDateTime_Time*)(o))->data[4] << 8)  |           \
        ((PyDateTime_Time*)(o))->data[5])
  #define PyDateTime_TIME_GET_FOLD(o)        (((PyDateTime_Time*)(o))->fold)
  #define PyDateTime_TIME_GET_TZINFO(o)      (_PyDateTime_HAS_TZINFO(o) ? \
      ((PyDateTime_Time *)(o))->tzinfo : Py_None)
  
  /* Apply for time delta instances */
  #define PyDateTime_DELTA_GET_DAYS(o)         (((PyDateTime_Delta*)(o))->days)
  #define PyDateTime_DELTA_GET_SECONDS(o)      (((PyDateTime_Delta*)(o))->seconds)
  #define PyDateTime_DELTA_GET_MICROSECONDS(o)            \
      (((PyDateTime_Delta*)(o))->microseconds)
  
  
  /* Define structure for C API. */
  typedef struct {
      /* type objects */
      PyTypeObject *DateType;
      PyTypeObject *DateTimeType;
      PyTypeObject *TimeType;
      PyTypeObject *DeltaType;
      PyTypeObject *TZInfoType;
  
      /* singletons */
      PyObject *TimeZone_UTC;
  
      /* constructors */
      PyObject *(*Date_FromDate)(int, int, int, PyTypeObject*);
      PyObject *(*DateTime_FromDateAndTime)(int, int, int, int, int, int, int,
          PyObject*, PyTypeObject*);
      PyObject *(*Time_FromTime)(int, int, int, int, PyObject*, PyTypeObject*);
      PyObject *(*Delta_FromDelta)(int, int, int, int, PyTypeObject*);
      PyObject *(*TimeZone_FromTimeZone)(PyObject *offset, PyObject *name);
  
      /* constructors for the DB API */
      PyObject *(*DateTime_FromTimestamp)(PyObject*, PyObject*, PyObject*);
      PyObject *(*Date_FromTimestamp)(PyObject*, PyObject*);
  
      /* PEP 495 constructors */
      PyObject *(*DateTime_FromDateAndTimeAndFold)(int, int, int, int, int, int, int,
          PyObject*, int, PyTypeObject*);
      PyObject *(*Time_FromTimeAndFold)(int, int, int, int, PyObject*, int, PyTypeObject*);
  
  } PyDateTime_CAPI;
  
  #define PyDateTime_CAPSULE_NAME "datetime.datetime_CAPI"
  
  
  /* This block is only used as part of the public API and should not be
   * included in _datetimemodule.c, which does not use the C API capsule.
   * See bpo-35081 for more details.
   * */
  #ifndef _PY_DATETIME_IMPL
  /* Define global variable for the C API and a macro for setting it. */
  static PyDateTime_CAPI *PyDateTimeAPI = NULL;
  
  #define PyDateTime_IMPORT \
      PyDateTimeAPI = (PyDateTime_CAPI *)PyCapsule_Import(PyDateTime_CAPSULE_NAME, 0)
  
  /* Macro for access to the UTC singleton */
  #define PyDateTime_TimeZone_UTC PyDateTimeAPI->TimeZone_UTC
  
  /* Macros for type checking when not building the Python core. */
  #define PyDate_Check(op) PyObject_TypeCheck((op), PyDateTimeAPI->DateType)
  #define PyDate_CheckExact(op) Py_IS_TYPE((op), PyDateTimeAPI->DateType)
  
  #define PyDateTime_Check(op) PyObject_TypeCheck((op), PyDateTimeAPI->DateTimeType)
  #define PyDateTime_CheckExact(op) Py_IS_TYPE((op), PyDateTimeAPI->DateTimeType)
  
  #define PyTime_Check(op) PyObject_TypeCheck((op), PyDateTimeAPI->TimeType)
  #define PyTime_CheckExact(op) Py_IS_TYPE((op), PyDateTimeAPI->TimeType)
  
  #define PyDelta_Check(op) PyObject_TypeCheck((op), PyDateTimeAPI->DeltaType)
  #define PyDelta_CheckExact(op) Py_IS_TYPE((op), PyDateTimeAPI->DeltaType)
  
  #define PyTZInfo_Check(op) PyObject_TypeCheck((op), PyDateTimeAPI->TZInfoType)
  #define PyTZInfo_CheckExact(op) Py_IS_TYPE((op), PyDateTimeAPI->TZInfoType)
  
  
  /* Macros for accessing constructors in a simplified fashion. */
  #define PyDate_FromDate(year, month, day) \
      PyDateTimeAPI->Date_FromDate((year), (month), (day), PyDateTimeAPI->DateType)
  
  #define PyDateTime_FromDateAndTime(year, month, day, hour, min, sec, usec) \
      PyDateTimeAPI->DateTime_FromDateAndTime((year), (month), (day), (hour), \
          (min), (sec), (usec), Py_None, PyDateTimeAPI->DateTimeType)
  
  #define PyDateTime_FromDateAndTimeAndFold(year, month, day, hour, min, sec, usec, fold) \
      PyDateTimeAPI->DateTime_FromDateAndTimeAndFold((year), (month), (day), (hour), \
          (min), (sec), (usec), Py_None, (fold), PyDateTimeAPI->DateTimeType)
  
  #define PyTime_FromTime(hour, minute, second, usecond) \
      PyDateTimeAPI->Time_FromTime((hour), (minute), (second), (usecond), \
          Py_None, PyDateTimeAPI->TimeType)
  
  #define PyTime_FromTimeAndFold(hour, minute, second, usecond, fold) \
      PyDateTimeAPI->Time_FromTimeAndFold((hour), (minute), (second), (usecond), \
          Py_None, (fold), PyDateTimeAPI->TimeType)
  
  #define PyDelta_FromDSU(days, seconds, useconds) \
      PyDateTimeAPI->Delta_FromDelta((days), (seconds), (useconds), 1, \
          PyDateTimeAPI->DeltaType)
  
  #define PyTimeZone_FromOffset(offset) \
      PyDateTimeAPI->TimeZone_FromTimeZone((offset), NULL)
  
  #define PyTimeZone_FromOffsetAndName(offset, name) \
      PyDateTimeAPI->TimeZone_FromTimeZone((offset), (name))
  
  /* Macros supporting the DB API. */
  #define PyDateTime_FromTimestamp(args) \
      PyDateTimeAPI->DateTime_FromTimestamp( \
          (PyObject*) (PyDateTimeAPI->DateTimeType), (args), NULL)
  
  #define PyDate_FromTimestamp(args) \
      PyDateTimeAPI->Date_FromTimestamp( \
          (PyObject*) (PyDateTimeAPI->DateType), (args))
  
  #endif   /* !defined(_PY_DATETIME_IMPL) */
  
  #ifdef __cplusplus
  }
  #endif
  #endif
  #endif /* !Py_LIMITED_API */
  