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1 // Windows/Time.cpp
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2
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3 #include "StdAfx.h"
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4
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5 #include "Time.h"
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6 #include "Windows/Defs.h"
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7
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8 namespace NWindows {
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9 namespace NTime {
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10
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11 bool DosTimeToFileTime(UInt32 dosTime, FILETIME &fileTime)
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12 {
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13 return BOOLToBool(::DosDateTimeToFileTime((UInt16)(dosTime >> 16), (UInt16)(dosTime & 0xFFFF), &fileTime));
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14 }
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15
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16 static const UInt32 kHighDosTime = 0xFF9FBF7D;
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17 static const UInt32 kLowDosTime = 0x210000;
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18
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19 bool FileTimeToDosTime(const FILETIME &fileTime, UInt32 &dosTime)
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20 {
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21 WORD datePart, timePart;
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22 if (!::FileTimeToDosDateTime(&fileTime, &datePart, &timePart))
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23 {
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24 dosTime = (fileTime.dwHighDateTime >= 0x01C00000) ? kHighDosTime : kLowDosTime;
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25 return false;
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26 }
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27 dosTime = (((UInt32)datePart) << 16) + timePart;
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28 return true;
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29 }
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30
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31 static const UInt32 kNumTimeQuantumsInSecond = 10000000;
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32 static const UInt64 kUnixTimeStartValue = ((UInt64)kNumTimeQuantumsInSecond) * 60 * 60 * 24 * 134774;
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33
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34 void UnixTimeToFileTime(UInt32 unixTime, FILETIME &fileTime)
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35 {
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36 UInt64 v = kUnixTimeStartValue + ((UInt64)unixTime) * kNumTimeQuantumsInSecond;
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37 fileTime.dwLowDateTime = (DWORD)v;
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38 fileTime.dwHighDateTime = (DWORD)(v >> 32);
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39 }
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40
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41 bool FileTimeToUnixTime(const FILETIME &fileTime, UInt32 &unixTime)
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42 {
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43 UInt64 winTime = (((UInt64)fileTime.dwHighDateTime) << 32) + fileTime.dwLowDateTime;
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44 if (winTime < kUnixTimeStartValue)
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45 {
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46 unixTime = 0;
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47 return false;
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48 }
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49 winTime = (winTime - kUnixTimeStartValue) / kNumTimeQuantumsInSecond;
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50 if (winTime > 0xFFFFFFFF)
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51 {
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52 unixTime = 0xFFFFFFFF;
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53 return false;
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54 }
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55 unixTime = (UInt32)winTime;
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56 return true;
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57 }
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58
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59 bool GetSecondsSince1601(unsigned year, unsigned month, unsigned day,
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60 unsigned hour, unsigned min, unsigned sec, UInt64 &resSeconds)
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61 {
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62 resSeconds = 0;
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63 if (year < 1601 || year >= 10000 || month < 1 || month > 12 ||
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64 day < 1 || day > 31 || hour > 23 || min > 59 || sec > 59)
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65 return false;
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66 UInt32 numYears = year - 1601;
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67 UInt32 numDays = numYears * 365 + numYears / 4 - numYears / 100 + numYears / 400;
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68 Byte ms[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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69 if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
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70 ms[1] = 29;
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71 month--;
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72 for (unsigned i = 0; i < month; i++)
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73 numDays += ms[i];
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74 numDays += day - 1;
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75 resSeconds = ((UInt64)(numDays * 24 + hour) * 60 + min) * 60 + sec;
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76 return true;
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77 }
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78
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79 void GetCurUtcFileTime(FILETIME &ft)
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80 {
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81 SYSTEMTIME st;
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82 GetSystemTime(&st);
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83 SystemTimeToFileTime(&st, &ft);
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84 }
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85
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86 }}
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