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1//
2// systime.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// The _getsystime() and _setsystime() functions.
7//
8#include <corecrt_internal_time.h>
9
10
11
12// Gets the current system time and stores it in 'result'. Returns the number
13// of milliseconds (the 'result' cannot store milliseconds).
14extern "C" unsigned __cdecl _getsystime(struct tm* const result)
15{
16 _VALIDATE_RETURN(result != nullptr, EINVAL, 0)
17
18 SYSTEMTIME local_time;
19 GetLocalTime(&local_time);
20
21 result->tm_isdst = -1; // mktime() computes whether this is
22 // during Standard or Daylight time.
23 result->tm_sec = static_cast<int>(local_time.wSecond);
24 result->tm_min = static_cast<int>(local_time.wMinute);
25 result->tm_hour = static_cast<int>(local_time.wHour);
26 result->tm_mday = static_cast<int>(local_time.wDay);
27 result->tm_mon = static_cast<int>(local_time.wMonth - 1);
28 result->tm_year = static_cast<int>(local_time.wYear - 1900);
29 result->tm_wday = static_cast<int>(local_time.wDayOfWeek);
30
31 // Normalize uninitialized fields:
32 _mktime32(result);
33
34 return (local_time.wMilliseconds);
35}
36
37
38
39// Sets the system time to the time specified by 'source' and 'milliseconds.
40// Returns zero on success; returns a system error code on failure.
41extern "C" unsigned __cdecl _setsystime(struct tm* const source, unsigned const milliseconds)
42{
43 _ASSERTE(source != nullptr);
44 if (source == nullptr)
45 return ERROR_INVALID_PARAMETER;
46
47 // Normalize uninitialized fields:
48 _mktime32(source);
49
50 SYSTEMTIME local_time;
51 local_time.wYear = static_cast<WORD>(source->tm_year + 1900);
52 local_time.wMonth = static_cast<WORD>(source->tm_mon + 1);
53 local_time.wDay = static_cast<WORD>(source->tm_mday);
54 local_time.wHour = static_cast<WORD>(source->tm_hour);
55 local_time.wMinute = static_cast<WORD>(source->tm_min);
56 local_time.wSecond = static_cast<WORD>(source->tm_sec);
57 local_time.wMilliseconds = static_cast<WORD>(milliseconds);
58
59 if (!SetLocalTime(&local_time))
60 return static_cast<int>(GetLastError());
61
62 return 0;
63}