72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
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/***
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*time64.c - get current system time
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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 _time64() - gets the current system time and converts it to
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* internal (__time64_t) format time.
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*
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*Revision History:
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* 05-20-98 GJF Created.
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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 <internal.h>
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#include <windows.h>
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/*
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* Number of 100 nanosecond units from 1/1/1601 to 1/1/1970
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*/
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#define EPOCH_BIAS 116444736000000000i64
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/*
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* Union to facilitate converting from FILETIME to unsigned __int64
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*/
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typedef union {
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unsigned __int64 ft_scalar;
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FILETIME ft_struct;
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} FT;
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/***
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*__time64_t _time64(timeptr) - Get current system time and convert to a
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* __time64_t value.
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*
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*Purpose:
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* Gets the current date and time and stores it in internal 64-bit format
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* (__time64_t). The time is returned and stored via the pointer passed in
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* timeptr. If timeptr == NULL, the time is only returned, not stored in
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* *timeptr. The internal (__time64_t) format is the number of seconds
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* since 00:00:00, Jan 1 1970 (UTC).
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*
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*Entry:
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* __time64_t *timeptr - pointer to long to store time in.
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*
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*Exit:
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* returns the current time.
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*
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*Exceptions:
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*
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*******************************************************************************/
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__time64_t __cdecl _time64 (
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__time64_t *timeptr
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)
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{
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__time64_t tim;
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FT nt_time;
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GetSystemTimeAsFileTime( &(nt_time.ft_struct) );
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tim = (__time64_t)((nt_time.ft_scalar - EPOCH_BIAS) / 10000000i64);
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if (timeptr)
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*timeptr = tim; /* store time if requested */
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return tim;
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}
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