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