114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/***
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*dtoxtm64.c - convert OS local time to __time64_t
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*
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* Copyright (c) 1998-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines __loctotime64_t() - convert OS local time to internal format
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* (__time64_t).
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*
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*Revision History:
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* 05-21-98 GJF Created.
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* 10-19-98 GJF Fill in tm_min and tm_sec before calling _isindst
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <time.h>
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#include <ctime.h>
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#include <internal.h>
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/***
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*__time64_t __loctotime64_t(yr, mo, dy, hr, mn, sc, dstflag) - converts OS
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* local time to internal time format (i.e., a __time64_t value)
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*
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*Purpose:
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* Converts a local time value, obtained in a broken down format from
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* the host OS, to __time64_t format (i.e., the number elapsed seconds
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* since 01-01-70, 00:00:00, UTC).
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*
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*Entry:
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* int yr, mo, dy - date
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* int hr, mn, sc - time
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* int dstflag - 1 if Daylight Time, 0 if Standard Time, -1 if
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* not specified.
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*
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*Exit:
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* Returns calendar time value.
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*
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*Exceptions:
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*
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*******************************************************************************/
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__time64_t __cdecl __loctotime64_t (
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int yr, /* 0 based */
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int mo, /* 1 based */
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int dy, /* 1 based */
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int hr,
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int mn,
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int sc,
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int dstflag )
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{
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int tmpdays;
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__time64_t tmptim;
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struct tm tb;
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/*
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* Do a quick range check on the year and convert it to a delta
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* off of 1900.
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*/
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if ( ((long)(yr -= 1900) < _BASE_YEAR) || ((long)yr > _MAX_YEAR64) )
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return (__time64_t)(-1);
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/*
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* Compute the number of elapsed days in the current year.
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*/
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tmpdays = dy + _days[mo - 1];
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if ( _IS_LEAP_YEAR(yr) && (mo > 2) )
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tmpdays++;
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/*
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* Compute the number of elapsed seconds since the Epoch. Note the
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* computation of elapsed leap years would break down after 2100
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* if such values were in range (fortunately, they aren't).
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*/
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tmptim = /* 365 days for each year */
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(((__time64_t)yr - _BASE_YEAR) * 365
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/* one day for each elapsed leap year */
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+ (__time64_t)_ELAPSED_LEAP_YEARS(yr)
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/* number of elapsed days in yr */
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+ tmpdays)
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/* convert to hours and add in hr */
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* 24 + hr;
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tmptim = /* convert to minutes and add in mn */
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(tmptim * 60 + mn)
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/* convert to seconds and add in sec */
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* 60 + sc;
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/*
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* Account for time zone.
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*/
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__tzset();
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tmptim += _timezone;
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/*
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* Fill in enough fields of tb for _isindst(), then call it to
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* determine DST.
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*/
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tb.tm_yday = tmpdays;
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tb.tm_year = yr;
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tb.tm_mon = mo - 1;
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tb.tm_hour = hr;
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tb.tm_min = mn;
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tb.tm_sec = sc;
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if ( (dstflag == 1) || ((dstflag == -1) && _daylight &&
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_isindst(&tb)) )
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tmptim += _dstbias;
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return(tmptim);
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}
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