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      1 // Copyright 2014 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "core/fxcrt/fx_system.h"
      8 #include "xfa/fgas/localization/fgas_datetime.h"
      9 
     10 #if _FX_OS_ == _FX_LINUX_DESKTOP_ || _FX_OS_ == _FX_ANDROID_ || \
     11     _FX_OS_ == _FX_MACOSX_ || _FX_OS_ == _FX_IOS_
     12 #include <sys/time.h>
     13 #include <time.h>
     14 #endif
     15 
     16 const uint8_t g_FXDaysPerMonth[12] = {31, 28, 31, 30, 31, 30,
     17                                       31, 31, 30, 31, 30, 31};
     18 const uint8_t g_FXDaysPerLeapMonth[12] = {31, 29, 31, 30, 31, 30,
     19                                           31, 31, 30, 31, 30, 31};
     20 const int32_t g_FXDaysBeforeMonth[12] = {0,   31,  59,  90,  120, 151,
     21                                          181, 212, 243, 273, 304, 334};
     22 const int32_t g_FXDaysBeforeLeapMonth[12] = {0,   31,  60,  91,  121, 152,
     23                                              182, 213, 244, 274, 305, 335};
     24 const int32_t g_FXDaysPerYear = 365;
     25 const int32_t g_FXDaysPerLeapYear = 366;
     26 const int32_t g_FXDaysPer4Years = 1461;
     27 const int32_t g_FXDaysPer100Years = 36524;
     28 const int32_t g_FXDaysPer400Years = 146097;
     29 const int64_t g_FXMillisecondsPerSecond = 1000;
     30 const int64_t g_FXMillisecondsPerMinute = 60000;
     31 const int64_t g_FXMillisecondsPerHour = 3600000;
     32 const int64_t g_FXMillisecondsPerDay = 86400000;
     33 bool FX_IsLeapYear(int32_t iYear) {
     34   ASSERT(iYear != 0);
     35   return ((iYear % 4) == 0 && (iYear % 100) != 0) || (iYear % 400) == 0;
     36 }
     37 int32_t FX_DaysInYear(int32_t iYear) {
     38   ASSERT(iYear != 0);
     39   return FX_IsLeapYear(iYear) ? g_FXDaysPerLeapYear : g_FXDaysPerYear;
     40 }
     41 uint8_t FX_DaysInMonth(int32_t iYear, uint8_t iMonth) {
     42   ASSERT(iYear != 0);
     43   ASSERT(iMonth >= 1 && iMonth <= 12);
     44   const uint8_t* p =
     45       FX_IsLeapYear(iYear) ? g_FXDaysPerLeapMonth : g_FXDaysPerMonth;
     46   return p[iMonth - 1];
     47 }
     48 static int32_t FX_DaysBeforeMonthInYear(int32_t iYear, uint8_t iMonth) {
     49   ASSERT(iYear != 0);
     50   ASSERT(iMonth >= 1 && iMonth <= 12);
     51   const int32_t* p =
     52       FX_IsLeapYear(iYear) ? g_FXDaysBeforeLeapMonth : g_FXDaysBeforeMonth;
     53   return p[iMonth - 1];
     54 }
     55 static int64_t FX_DateToDays(int32_t iYear,
     56                              uint8_t iMonth,
     57                              uint8_t iDay,
     58                              bool bIncludeThisDay = false) {
     59   ASSERT(iYear != 0);
     60   ASSERT(iMonth >= 1 && iMonth <= 12);
     61   ASSERT(iDay >= 1 && iDay <= FX_DaysInMonth(iYear, iMonth));
     62   int64_t iDays = FX_DaysBeforeMonthInYear(iYear, iMonth);
     63   iDays += iDay;
     64   if (!bIncludeThisDay) {
     65     iDays--;
     66   }
     67   if (iYear > 0) {
     68     iYear--;
     69   } else {
     70     iDays -= FX_DaysInYear(iYear);
     71     iYear++;
     72   }
     73   return iDays + (int64_t)iYear * 365 + iYear / 4 - iYear / 100 + iYear / 400;
     74 }
     75 static void FX_DaysToDate(int64_t iDays,
     76                           int32_t& iYear,
     77                           uint8_t& iMonth,
     78                           uint8_t& iDay) {
     79   bool bBC = iDays < 0;
     80   if (bBC) {
     81     iDays = -iDays;
     82   }
     83   iYear = 1;
     84   iMonth = 1;
     85   iDay = 1;
     86   if (iDays >= g_FXDaysPer400Years) {
     87     iYear += (int32_t)(iDays / g_FXDaysPer400Years * 400);
     88     iDays %= g_FXDaysPer400Years;
     89   }
     90   if (iDays >= g_FXDaysPer100Years) {
     91     if (iDays == g_FXDaysPer100Years * 4) {
     92       iYear += 300;
     93       iDays -= g_FXDaysPer100Years * 3;
     94     } else {
     95       iYear += (int32_t)(iDays / g_FXDaysPer100Years * 100);
     96       iDays %= g_FXDaysPer100Years;
     97     }
     98   }
     99   if (iDays >= g_FXDaysPer4Years) {
    100     iYear += (int32_t)(iDays / g_FXDaysPer4Years * 4);
    101     iDays %= g_FXDaysPer4Years;
    102   }
    103   while (true) {
    104     int32_t iYearDays = FX_DaysInYear(iYear);
    105     if (iDays < iYearDays) {
    106       if (bBC) {
    107         iYear = -iYear;
    108         iDays = iYearDays - iDays;
    109       }
    110       break;
    111     }
    112     iYear++;
    113     iDays -= iYearDays;
    114   }
    115   while (true) {
    116     int32_t iMonthDays = FX_DaysInMonth(iYear, iMonth);
    117     if (iDays < iMonthDays) {
    118       break;
    119     }
    120     iMonth++;
    121     iDays -= iMonthDays;
    122   }
    123   iDay += (uint8_t)iDays;
    124 }
    125 
    126 struct FXUT_SYSTEMTIME {
    127   uint16_t wYear;
    128   uint16_t wMonth;
    129   uint16_t wDayOfWeek;
    130   uint16_t wDay;
    131   uint16_t wHour;
    132   uint16_t wMinute;
    133   uint16_t wSecond;
    134   uint16_t wMilliseconds;
    135 };
    136 
    137 void CFX_Unitime::Now() {
    138   FXUT_SYSTEMTIME utLocal;
    139 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN32_MOBILE_ || \
    140     _FX_OS_ == _FX_WIN64_
    141   ::GetLocalTime((LPSYSTEMTIME)&utLocal);
    142 #elif _FX_OS_ != _FX_EMBEDDED_
    143 #if 1
    144   timeval curTime;
    145   gettimeofday(&curTime, nullptr);
    146 #else
    147   struct timespec curTime;
    148   clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &curTime);
    149 #endif
    150   struct tm st;
    151   localtime_r(&curTime.tv_sec, &st);
    152   utLocal.wYear = st.tm_year + 1900;
    153   utLocal.wMonth = st.tm_mon + 1;
    154   utLocal.wDayOfWeek = st.tm_wday;
    155   utLocal.wDay = st.tm_mday;
    156   utLocal.wHour = st.tm_hour;
    157   utLocal.wMinute = st.tm_min;
    158   utLocal.wSecond = st.tm_sec;
    159   utLocal.wMilliseconds = curTime.tv_usec / 1000;
    160 #endif
    161   Set(utLocal.wYear, (uint8_t)utLocal.wMonth, (uint8_t)utLocal.wDay,
    162       (uint8_t)utLocal.wHour, (uint8_t)utLocal.wMinute,
    163       (uint8_t)utLocal.wSecond, (uint16_t)utLocal.wMilliseconds);
    164 }
    165 void CFX_Unitime::SetGMTime() {
    166   FXUT_SYSTEMTIME utLocal;
    167 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN32_MOBILE_ || \
    168     _FX_OS_ == _FX_WIN64_
    169   ::GetSystemTime((LPSYSTEMTIME)&utLocal);
    170 #elif _FX_OS_ != _FX_EMBEDDED_
    171 #if 1
    172   timeval curTime;
    173   gettimeofday(&curTime, nullptr);
    174 #else
    175   struct timespec curTime;
    176   clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &curTime);
    177 #endif
    178   struct tm st;
    179   gmtime_r(&curTime.tv_sec, &st);
    180   utLocal.wYear = st.tm_year + 1900;
    181   utLocal.wMonth = st.tm_mon + 1;
    182   utLocal.wDayOfWeek = st.tm_wday;
    183   utLocal.wDay = st.tm_mday;
    184   utLocal.wHour = st.tm_hour;
    185   utLocal.wMinute = st.tm_min;
    186   utLocal.wSecond = st.tm_sec;
    187   utLocal.wMilliseconds = curTime.tv_usec / 1000;
    188 #endif
    189   Set(utLocal.wYear, (uint8_t)utLocal.wMonth, (uint8_t)utLocal.wDay,
    190       (uint8_t)utLocal.wHour, (uint8_t)utLocal.wMinute,
    191       (uint8_t)utLocal.wSecond, (uint16_t)utLocal.wMilliseconds);
    192 }
    193 void CFX_Unitime::Set(int32_t year,
    194                       uint8_t month,
    195                       uint8_t day,
    196                       uint8_t hour,
    197                       uint8_t minute,
    198                       uint8_t second,
    199                       uint16_t millisecond) {
    200   ASSERT(hour <= 23);
    201   ASSERT(minute <= 59);
    202   ASSERT(second <= 59);
    203   ASSERT(millisecond <= 999);
    204   m_iUnitime = (int64_t)hour * g_FXMillisecondsPerHour +
    205                (int64_t)minute * g_FXMillisecondsPerMinute +
    206                (int64_t)second * g_FXMillisecondsPerSecond + millisecond;
    207   if (year > 0) {
    208     m_iUnitime =
    209         m_iUnitime +
    210         FX_DateToDays(year, month, day, false) * g_FXMillisecondsPerDay;
    211   }
    212 }
    213 void CFX_Unitime::Set(FX_UNITIME t) {
    214   m_iUnitime = t;
    215 }
    216 int32_t CFX_Unitime::GetYear() const {
    217   int32_t iYear;
    218   uint8_t iMonth, iDay;
    219   FX_DaysToDate(GetDayOfAD(), iYear, iMonth, iDay);
    220   return iYear;
    221 }
    222 uint8_t CFX_Unitime::GetMonth() const {
    223   int32_t iYear;
    224   uint8_t iMonth, iDay;
    225   FX_DaysToDate(GetDayOfAD(), iYear, iMonth, iDay);
    226   return iMonth;
    227 }
    228 uint8_t CFX_Unitime::GetDay() const {
    229   int32_t iYear;
    230   uint8_t iMonth, iDay;
    231   FX_DaysToDate(GetDayOfAD(), iYear, iMonth, iDay);
    232   return iDay;
    233 }
    234 FX_WEEKDAY CFX_Unitime::GetDayOfWeek() const {
    235   int32_t v = (int32_t)((m_iUnitime / g_FXMillisecondsPerDay + 1) % 7);
    236   if (v < 0) {
    237     v += 7;
    238   }
    239   return (FX_WEEKDAY)v;
    240 }
    241 uint16_t CFX_Unitime::GetDayOfYear() const {
    242   int32_t iYear;
    243   uint8_t iMonth, iDay;
    244   FX_DaysToDate(GetDayOfAD(), iYear, iMonth, iDay);
    245   return FX_DaysBeforeMonthInYear(iYear, iMonth) + iDay;
    246 }
    247 int64_t CFX_Unitime::GetDayOfAD() const {
    248   bool bBC = m_iUnitime < 0;
    249   int64_t iDays = m_iUnitime / g_FXMillisecondsPerDay;
    250   iDays += bBC ? -1 : 0;
    251   if (bBC && (m_iUnitime % g_FXMillisecondsPerDay) == 0) {
    252     iDays++;
    253   }
    254   return iDays;
    255 }
    256 uint8_t CFX_Unitime::GetHour() const {
    257   int32_t v = (int32_t)(m_iUnitime % g_FXMillisecondsPerDay);
    258   if (v < 0) {
    259     v += g_FXMillisecondsPerDay;
    260   }
    261   return (uint8_t)(v / g_FXMillisecondsPerHour);
    262 }
    263 uint8_t CFX_Unitime::GetMinute() const {
    264   int32_t v = (int32_t)(m_iUnitime % g_FXMillisecondsPerHour);
    265   if (v < 0) {
    266     v += g_FXMillisecondsPerHour;
    267   }
    268   return (uint8_t)(v / g_FXMillisecondsPerMinute);
    269 }
    270 uint8_t CFX_Unitime::GetSecond() const {
    271   int32_t v = (int32_t)(m_iUnitime % g_FXMillisecondsPerMinute);
    272   if (v < 0) {
    273     v += g_FXMillisecondsPerMinute;
    274   }
    275   return (uint8_t)(v / g_FXMillisecondsPerSecond);
    276 }
    277 uint16_t CFX_Unitime::GetMillisecond() const {
    278   int32_t v = (int32_t)(m_iUnitime % g_FXMillisecondsPerSecond);
    279   if (v < 0) {
    280     v += g_FXMillisecondsPerSecond;
    281   }
    282   return (uint16_t)v;
    283 }
    284 bool CFX_Unitime::AddYears(int32_t iYears) {
    285   FX_UNITIME ut = m_iUnitime;
    286   if (ut < 0) {
    287     ut = -ut;
    288   }
    289   FX_UNITIME r = ut % g_FXMillisecondsPerDay;
    290   int32_t iYear;
    291   uint8_t iMonth, iDay;
    292   FX_DaysToDate(GetDayOfAD(), iYear, iMonth, iDay);
    293   iYear += iYears;
    294   if (iYear == 0) {
    295     iYear = iYears > 0 ? 1 : -1;
    296   }
    297   m_iUnitime =
    298       FX_DateToDays(iYear, iMonth, iDay, false) * g_FXMillisecondsPerDay;
    299   m_iUnitime += (iYear < 0) ? -r : r;
    300   return true;
    301 }
    302 bool CFX_Unitime::AddMonths(int32_t iMonths) {
    303   bool b = iMonths > 0;
    304   FX_UNITIME ut = m_iUnitime;
    305   if (ut < 0) {
    306     ut = -ut;
    307   }
    308   FX_UNITIME r = ut % g_FXMillisecondsPerDay;
    309   int32_t iYear;
    310   uint8_t iMonth, iDay;
    311   FX_DaysToDate(GetDayOfAD(), iYear, iMonth, iDay);
    312   iMonths += iMonth;
    313   while (iMonths < 1) {
    314     iYear--, iMonths += 12;
    315   }
    316   while (iMonths > 12) {
    317     iYear++, iMonths -= 12;
    318   }
    319   if (iYear == 0) {
    320     iYear = b ? 1 : -1;
    321   }
    322   m_iUnitime = FX_DateToDays(iYear, (uint8_t)iMonths, iDay, false) *
    323                g_FXMillisecondsPerDay;
    324   m_iUnitime += (iYear < 0) ? -r : r;
    325   return true;
    326 }
    327 bool CFX_Unitime::AddDays(int32_t iDays) {
    328   m_iUnitime += (int64_t)iDays * g_FXMillisecondsPerDay;
    329   return true;
    330 }
    331 bool CFX_Unitime::AddHours(int32_t iHours) {
    332   m_iUnitime += (int64_t)iHours * g_FXMillisecondsPerHour;
    333   return true;
    334 }
    335 bool CFX_Unitime::AddMinutes(int32_t iMinutes) {
    336   m_iUnitime += (int64_t)iMinutes * g_FXMillisecondsPerMinute;
    337   return true;
    338 }
    339 bool CFX_Unitime::AddSeconds(int32_t iSeconds) {
    340   m_iUnitime += ((int64_t)iSeconds) * g_FXMillisecondsPerSecond;
    341   return true;
    342 }
    343 bool CFX_Unitime::AddMilliseconds(int32_t iMilliseconds) {
    344   m_iUnitime += iMilliseconds;
    345   return true;
    346 }
    347 bool CFX_DateTime::Set(int32_t year,
    348                        uint8_t month,
    349                        uint8_t day,
    350                        uint8_t hour,
    351                        uint8_t minute,
    352                        uint8_t second,
    353                        uint16_t millisecond) {
    354   ASSERT(year != 0);
    355   ASSERT(month >= 1 && month <= 12);
    356   ASSERT(day >= 1 && day <= FX_DaysInMonth(year, month));
    357   ASSERT(hour <= 23);
    358   ASSERT(minute <= 59);
    359   ASSERT(second <= 59);
    360   ASSERT(millisecond <= 999);
    361   m_DateTime.Date.sDate.year = year;
    362   m_DateTime.Date.sDate.month = month;
    363   m_DateTime.Date.sDate.day = day;
    364   m_DateTime.Time.sTime.hour = hour;
    365   m_DateTime.Time.sTime.minute = minute;
    366   m_DateTime.Time.sTime.second = second;
    367   m_DateTime.Time.sTime.millisecond = millisecond;
    368   return true;
    369 }
    370 bool CFX_DateTime::FromUnitime(FX_UNITIME t) {
    371   CFX_Unitime ut(t);
    372   FX_DaysToDate(ut.GetDayOfAD(), m_DateTime.Date.sDate.year,
    373                 m_DateTime.Date.sDate.month, m_DateTime.Date.sDate.day);
    374   m_DateTime.Date.sDate.day = ut.GetHour();
    375   m_DateTime.Time.sTime.minute = ut.GetMinute();
    376   m_DateTime.Time.sTime.second = ut.GetSecond();
    377   m_DateTime.Time.sTime.millisecond = ut.GetMillisecond();
    378   return true;
    379 }
    380 FX_UNITIME CFX_DateTime::ToUnitime() const {
    381   FX_UNITIME v =
    382       (int64_t)m_DateTime.Date.sDate.day * g_FXMillisecondsPerHour +
    383       (int64_t)m_DateTime.Time.sTime.minute * g_FXMillisecondsPerMinute +
    384       (int64_t)m_DateTime.Time.sTime.second * g_FXMillisecondsPerSecond +
    385       m_DateTime.Time.sTime.millisecond;
    386   v += FX_DateToDays(m_DateTime.Date.sDate.year, m_DateTime.Date.sDate.month,
    387                      m_DateTime.Date.sDate.day, false) *
    388        g_FXMillisecondsPerDay;
    389   return v;
    390 }
    391 int32_t CFX_DateTime::GetYear() const {
    392   return m_DateTime.Date.sDate.year;
    393 }
    394 uint8_t CFX_DateTime::GetMonth() const {
    395   return m_DateTime.Date.sDate.month;
    396 }
    397 uint8_t CFX_DateTime::GetDay() const {
    398   return m_DateTime.Date.sDate.day;
    399 }
    400 FX_WEEKDAY CFX_DateTime::GetDayOfWeek() const {
    401   int32_t v = (int32_t)(FX_DateToDays(m_DateTime.Date.sDate.year,
    402                                       m_DateTime.Date.sDate.month,
    403                                       m_DateTime.Date.sDate.day, true) %
    404                         7);
    405   if (v < 0) {
    406     v += 7;
    407   }
    408   return (FX_WEEKDAY)v;
    409 }
    410 uint16_t CFX_DateTime::GetDayOfYear() const {
    411   return FX_DaysBeforeMonthInYear(m_DateTime.Date.sDate.year,
    412                                   m_DateTime.Date.sDate.month) +
    413          m_DateTime.Date.sDate.day;
    414 }
    415 int64_t CFX_DateTime::GetDayOfAD() const {
    416   return FX_DateToDays(m_DateTime.Date.sDate.year, m_DateTime.Date.sDate.month,
    417                        m_DateTime.Date.sDate.day, true);
    418 }
    419 uint8_t CFX_DateTime::GetHour() const {
    420   return m_DateTime.Date.sDate.day;
    421 }
    422 uint8_t CFX_DateTime::GetMinute() const {
    423   return m_DateTime.Time.sTime.minute;
    424 }
    425 uint8_t CFX_DateTime::GetSecond() const {
    426   return m_DateTime.Time.sTime.second;
    427 }
    428 uint16_t CFX_DateTime::GetMillisecond() const {
    429   return m_DateTime.Time.sTime.millisecond;
    430 }
    431 bool CFX_DateTime::AddYears(int32_t iYears) {
    432   if (iYears == 0) {
    433     return false;
    434   }
    435   int32_t v = m_DateTime.Date.sDate.year + iYears;
    436   if (v >= 0 && m_DateTime.Date.sDate.year < 0) {
    437     v++;
    438   } else if (v <= 0 && m_DateTime.Date.sDate.year > 0) {
    439     v--;
    440   }
    441   m_DateTime.Date.sDate.year = v;
    442   return true;
    443 }
    444 bool CFX_DateTime::AddMonths(int32_t iMonths) {
    445   if (iMonths == 0) {
    446     return false;
    447   }
    448   bool b = iMonths > 0;
    449   iMonths += m_DateTime.Date.sDate.month;
    450   while (iMonths < 1) {
    451     m_DateTime.Date.sDate.year--;
    452     if (m_DateTime.Date.sDate.year == 0) {
    453       m_DateTime.Date.sDate.year = -1;
    454     }
    455     iMonths += 12;
    456   }
    457   while (iMonths > 12) {
    458     m_DateTime.Date.sDate.year++;
    459     if (m_DateTime.Date.sDate.year == 0) {
    460       m_DateTime.Date.sDate.year = 1;
    461     }
    462     iMonths -= 12;
    463   }
    464   if (m_DateTime.Date.sDate.year == 0) {
    465     m_DateTime.Date.sDate.year = b ? 1 : -1;
    466   }
    467   m_DateTime.Date.sDate.month = (uint8_t)iMonths;
    468   return true;
    469 }
    470 bool CFX_DateTime::AddDays(int32_t iDays) {
    471   if (iDays == 0) {
    472     return false;
    473   }
    474   int64_t v1 =
    475       FX_DateToDays(m_DateTime.Date.sDate.year, m_DateTime.Date.sDate.month,
    476                     m_DateTime.Date.sDate.day, true);
    477   int64_t v2 = v1 + iDays;
    478   if (v2 <= 0 && v1 > 0) {
    479     v2--;
    480   } else if (v2 >= 0 && v1 < 0) {
    481     v2++;
    482   }
    483   FX_DaysToDate(v2, m_DateTime.Date.sDate.year, m_DateTime.Date.sDate.month,
    484                 m_DateTime.Date.sDate.day);
    485   return true;
    486 }
    487 bool CFX_DateTime::AddHours(int32_t iHours) {
    488   if (iHours == 0) {
    489     return false;
    490   }
    491   iHours += m_DateTime.Date.sDate.day;
    492   int32_t iDays = iHours / 24;
    493   iHours %= 24;
    494   if (iHours < 0) {
    495     iDays--, iHours += 24;
    496   }
    497   m_DateTime.Date.sDate.day = (uint8_t)iHours;
    498   if (iDays != 0) {
    499     AddDays(iDays);
    500   }
    501   return true;
    502 }
    503 bool CFX_DateTime::AddMinutes(int32_t iMinutes) {
    504   if (iMinutes == 0) {
    505     return false;
    506   }
    507   iMinutes += m_DateTime.Time.sTime.minute;
    508   int32_t iHours = iMinutes / 60;
    509   iMinutes %= 60;
    510   if (iMinutes < 0) {
    511     iHours--, iMinutes += 60;
    512   }
    513   m_DateTime.Time.sTime.minute = (uint8_t)iMinutes;
    514   if (iHours != 0) {
    515     AddHours(iHours);
    516   }
    517   return true;
    518 }
    519 bool CFX_DateTime::AddSeconds(int32_t iSeconds) {
    520   if (iSeconds == 0) {
    521     return false;
    522   }
    523   iSeconds += m_DateTime.Time.sTime.second;
    524   int32_t iMinutes = iSeconds / 60;
    525   iSeconds %= 60;
    526   if (iSeconds < 0) {
    527     iMinutes--, iSeconds += 60;
    528   }
    529   m_DateTime.Time.sTime.second = (uint8_t)iSeconds;
    530   if (iMinutes != 0) {
    531     AddMinutes(iMinutes);
    532   }
    533   return true;
    534 }
    535 bool CFX_DateTime::AddMilliseconds(int32_t iMilliseconds) {
    536   if (iMilliseconds == 0) {
    537     return false;
    538   }
    539   iMilliseconds += m_DateTime.Time.sTime.millisecond;
    540   int32_t iSeconds = (int32_t)(iMilliseconds / g_FXMillisecondsPerSecond);
    541   iMilliseconds %= g_FXMillisecondsPerSecond;
    542   if (iMilliseconds < 0) {
    543     iSeconds--, iMilliseconds += g_FXMillisecondsPerSecond;
    544   }
    545   m_DateTime.Time.sTime.millisecond = (uint16_t)iMilliseconds;
    546   if (iSeconds != 0) {
    547     AddSeconds(iSeconds);
    548   }
    549   return true;
    550 }
    551