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58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* Copyright (c) 2020-2021 Contributors to ksh 93u+m *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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#pragma prototyped
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/*
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* Glenn Fowler
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* AT&T Research
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*
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* time_t conversion support
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*/
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#include <tm.h>
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/*
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* use one of the 14 equivalent calendar years to determine
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* daylight savings time for future years beyond the range
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* of the local system (via tmxtm())
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*/
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static const short equiv[] =
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{
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2006, 2012,
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2001, 2024,
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2002, 2008,
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2003, 2020,
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2009, 2004,
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2010, 2016,
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2005, 2000,
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};
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/*
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* return the circa 2000 equivalent calendar year for tm
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*/
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int
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tmequiv(Tm_t* tm)
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{
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return tm->tm_year < (2038 - 1900) ? (tm->tm_year + 1900) : equiv[tm->tm_wday + tmisleapyear(tm->tm_year)];
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}
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