minivmac4ios/Mini vMac/mnvm_core/DATE2SEC.h

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/* DATE2SEC.h Copyright (C) 2003 Bradford L. Barrett, Paul C. Pratt You can redistribute this file and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation. You should have received a copy of the license along with this file; see the file COPYING. This file is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the license for more details. */ /* DATE 2(to) SEConds convert year/month/day/hour/minute/second to number of seconds since the beginning of 1904, the format for storing dates on the Macintosh. The function jdate is from the program Webalizer by Bradford L. Barrett. */ #ifdef DATE2SEC_H #error "header already included" #else #define DATE2SEC_H #endif /* The function jdate was found at the end of the file webalizer.c in the program webalizer at "www.mrunix.net/webalizer/". Here is copyright info from the top of that file: webalizer - a web server log analysis program Copyright (C) 1997-2000 Bradford L. Barrett (brad@mrunix.net) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version, and provided that the above copyright and permission notice is included with all distributed copies of this or derived software. */ /* ************************************************************* */ /* */ /* JDATE - Julian date calculator */ /* */ /* Calculates the number of days since Jan 1, 0000. */ /* */ /* Originally written by Bradford L. Barrett (03/17/1988) */ /* Returns an unsigned long value representing the number of */ /* days since January 1, 0000. */ /* */ /* Note: Due to the changes made by Pope Gregory XIII in the */ /* 16th Centyry (Feb 24, 1582), dates before 1583 will */ /* not return a truely accurate number (will be at least */ /* 10 days off). Somehow, I don't think this will */ /* present much of a problem for most situations :) */ /* */ /* Usage: days = jdate(day, month, year) */ /* */ /* The number returned is adjusted by 5 to facilitate day of */ /* week calculations. The mod of the returned value gives the */ /* day of the week the date is. (ie: dow = days % 7) where */ /* dow will return 0=Sunday, 1=Monday, 2=Tuesday, etc... */ /* */ /* ************************************************************* */ LOCALFUNC ui5b jdate(int day, int month, int year) { ui5b days; /* value returned */ int mtable[] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; /* First, calculate base number including leap and Centenial year stuff */ days = (((ui5b)year * 365) + day + mtable[month - 1] + ((year + 4) / 4) - ((year / 100) - (year / 400))); /* now adjust for leap year before March 1st */ if ((year % 4 == 0) && (! ((year % 100 == 0) && (year % 400 != 0))) && (month < 3)) { --days; } /* done, return with calculated value */ return (days + 5); } LOCALFUNC ui5b Date2MacSeconds(int second, int minute, int hour, int day, int month, int year) { ui5b curjdate; ui5b basejdate; curjdate = jdate(day, month, year); basejdate = jdate(1, 1, 1904); return (((curjdate - basejdate) * 24 + hour) * 60 + minute) * 60 + second; }