Source code of Windows XP (NT5)
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/***
*ctime.h - constant for dates and times** Copyright (c) 1985-1993, 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]**Revision History:* 03-??-84 RLB written* 05-??-84 DFW split out the constant from each routine into this file* 07-27-89 GJF Fixed copyright* 10-30-89 GJF Fixed copyright (again)* 02-28-90 GJF Added #ifndef _INC_CTIME stuff.* 03-29-93 GJF Revised constants.*****/
#ifndef _INC_CTIME
#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 */
#define _INC_CTIME
#endif /* _INC_CTIME */
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