/*********************************************************************** * * * This software is part of the ast package * * Copyright (c) 1985-2011 AT&T Intellectual Property * * and is licensed under the * * Common Public License, Version 1.0 * * by AT&T Intellectual Property * * * * A copy of the License is available at * * http://www.opensource.org/licenses/cpl1.0.txt * * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * * * * Information and Software Systems Research * * AT&T Research * * Florham Park NJ * * * * Glenn Fowler <gsf@research.att.com> * * David Korn <dgk@research.att.com> * * Phong Vo <kpv@research.att.com> * * * ***********************************************************************/ #pragma prototyped /* * Glenn Fowler * AT&T Research * * time_t conversion support */ #include <tm.h> /* * use one of the 14 equivalent calendar years to determine * daylight savings time for future years beyond the range * of the local system (via tmxtm()) */ static const short equiv[] = { 2006, 2012, 2001, 2024, 2002, 2008, 2003, 2020, 2009, 2004, 2010, 2016, 2005, 2000, }; /* * return the circa 2000 equivalent calendar year for tm */ int tmequiv(Tm_t* tm) { return tm->tm_year < (2038 - 1900) ? (tm->tm_year + 1900) : equiv[tm->tm_wday + tmisleapyear(tm->tm_year)]; }