ctime.h

C标准库源代码

/***
*ctime.h - constant for dates and times
*
*       Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
*       Include file used by the ctime routines containing definitions of
*       various constants used in determining dates and times.
*
*       [Internal]
*
****/

#if _MSC_VER > 1000
#pragma once
#endif  /* _MSC_VER > 1000 */

#ifndef _INC_CTIME
#define _INC_CTIME

#ifndef _CRTBLD
/*
 * This is an internal C runtime header file. It is used when building
 * the C runtimes only. It is not to be used as a public header file.
 */
#error ERROR: Use of C runtime library internal header file.
#endif  /* _CRTBLD */

#define _DAY_SEC           (24L * 60L * 60L)    /* secs in a day */

#define _YEAR_SEC          (365L * _DAY_SEC)    /* secs in a year */

#define _FOUR_YEAR_SEC     (1461L * _DAY_SEC)   /* secs in a 4 year interval */

#define _DEC_SEC           315532800L           /* secs in 1970-1979 */

#define _BASE_YEAR         70L                  /* 1970 is the base year */

#define _BASE_DOW          4                    /* 01-01-70 was a Thursday */

#define _LEAP_YEAR_ADJUST  17L                  /* Leap years 1900 - 1970 */

#define _MAX_YEAR          138L                 /* 2038 is the max year */

#endif  /* _INC_CTIME */