C++以double方式表示时间

#include "stdafx.h" #include "HTime.h" const int DateDelta = 693594;// Days between 1/1/0001 and 12/31/1899 const int HoursPerDay = 24;//hours per day const int MinsPerHour = 60;//minutes per hour const int SecsPerMin = 60;//seconds per minute const int MSecsPerSec = 1000;//milliseconds per second const double MinDateTime= -657434.0; // 01/01/0100 12:00:00.000 AM const double MaxDateTime= 2958465.99999; // 12/31/9999 11:59:59.999 PM //获取当前时间的年月日，小时，分钟，秒，以及毫秒 void DencoderNowTime(int & nYear,int & nMonth,int &nDay,int & nHour,int & nMin,int &nSec,int &nMSec) { SYSTEMTIME tTime; GetLocalTime(&tTime); nYear = tTime.wYear; nMonth = tTime.wMonth; nDay = tTime.wDay; nHour = tTime.wHour; nMin = tTime.wMinute; nSec = tTime.wSecond; nMSec = tTime.wMilliseconds; return ; } TDateTime GetDate() { SYSTEMTIME tTime; GetLocalTime(&tTime); return EncodeDateTime(tTime.wYear,tTime.wMonth,tTime.wDay,0,0,0,0); } TDateTime GetNow() { SYSTEMTIME tTime; GetLocalTime(&tTime); return EncodeDateTime(tTime.wYear,tTime.wMonth,tTime.wDay,tTime.wHour,tTime.wMinute,tTime.wSecond,tTime.wMilliseconds); } string GetNowString() { SYSTEMTIME tTime; GetLocalTime(&tTime); char strTime[200] = {'\0'}; sprintf(strTime,"%04d-%02d-%02d %02d:%02d:%02d:%03d\0", tTime.wYear, tTime.wMonth, tTime.wDay, tTime.wHour, tTime.wMinute, tTime.wSecond, tTime.wMilliseconds); return std::string(strTime); } BOOL IsLeapYear(WORD Year) { return (((Year % 4) == 0) && ((Year % 100) != 0)) || ((Year % 400) == 0); } void DivMod(int dividend,int divisor,WORD *result,WORD *remainder) { *result=dividend/divisor; *remainder=dividend%divisor; } //convert datetime to double type TDateTime EncodeDateTime(WORD year,WORD month,WORD day,WORD hour,WORD min,WORD sec,WORD msec) { const int MinsPerDay = HoursPerDay * MinsPerHour;//minutes per day const int SecsPerDay = MinsPerDay * SecsPerMin; //seconds per day const int SecsPerHour = SecsPerMin * MinsPerHour; //seconds per hour const int MSecsPerDay = SecsPerDay * MSecsPerSec; //milliseconds per day int i; int days[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; double date; double time; date=0; time=0; if ((year >= 1) && (year <= 9999) && (month >= 1) && (month <= 12)) { //leap year if ((year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0))) days[2]=29; if ((day >= 1) && (day <= days[month])) { for( i=1;i<=month-1;i++) day+=days[i]; year-=1; date= year * 365 + year / 4 - year / 100 + year / 400 + day - DateDelta; if ((hour < HoursPerDay) && (min < MinsPerHour) && (sec < SecsPerMin) && (msec < MSecsPerSec)) { time = (hour * (MinsPerHour * SecsPerMin * MSecsPerSec) + min * (SecsPerMin * MSecsPerSec) + sec * MSecsPerSec + msec); time/=MSecsPerDay; } return date+time; } } return 1; // 12/31/1899 } void DecodeDateTime(TDateTime dt,WORD *year,WORD *month,WORD *day,WORD *hour,WORD *min,WORD *sec,WORD *msec) { const int MinsPerDay = HoursPerDay * MinsPerHour;//minutes per day const int SecsPerDay = MinsPerDay * SecsPerMin; //seconds per day const int SecsPerHour = SecsPerMin * MinsPerHour; //seconds per hour const int MSecsPerDay = SecsPerDay * MSecsPerSec; //milliseconds per day const int D1 = 365; const int D4 = D1 * 4 + 1; const int D100 = D4 * 25 - 1; const int D400 = D100 * 4 + 1; // WORD y,m,d,r,temp; WORD hh,mm,ss,mss; char str[20]; // int ipart;//integer part double fpart;//float part int date,time; //date and time //int MinCount, MSecCount; WORD MinCount, MSecCount; int days[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; ipart=0; fpart=0; y=0;m=0;d=0;r=0,temp=0; hh=0;mm=0;ss=0;mss=0; MinCount=0; MSecCount=0; if(!(dt< MinDateTime)||(dt >(int)MaxDateTime+1.0)) { ipart=(int)(dt); fpart=dt-ipart; date=ipart+DateDelta; time=(int)(MSecsPerDay*fpart); //-------------------------decode date------------------------- if (date<=0) { *year=1899; *month=12; *day=31; *hour=0; *min=0; *sec=0; *msec=0; } else { temp=date % 7 +1; date-=1; y=1; while(date >= D400) { date-=D400; y+=400; } DivMod(date,D100,&r,&d); if (r==4) { r-=1; d+=D100; } y+=r*100; DivMod(d, D4, &r,&d); y+=r*4; DivMod(d,D1,&r,&d); if (r==4) { r-=1; d+=D1; } y+=r; //leap year if ((y % 4 == 0) && ((y % 100 != 0) || (y % 400 == 0))) days[2]=29; m = 1; while(1) { r=days[m]; if (d< r) break; d-=r; m+=1; } *year = y; *month = m; *day = d + 1; } DivMod(time, SecsPerMin * MSecsPerSec, &MinCount, &MSecCount); DivMod(MinCount, MinsPerHour, &hh, &mm); DivMod(MSecCount, MSecsPerSec, &ss, &mss); *hour=hh; *min=mm; *sec=ss; *msec=mss; } } CString FormatDateTime(const char * cFormat,TDateTime dt) { CString sRet(cFormat); SYSTEMTIME tTime; DecodeDateTime(dt,&tTime.wYear,&tTime.wMonth,&tTime.wDay,&tTime.wHour,&tTime.wMinute,&tTime.wSecond,&tTime.wMilliseconds); char Newchar[10]; sprintf(Newchar,"%04d\0",tTime.wYear); sRet.Replace("YYYY",Newchar); sprintf(Newchar,"%02d\0",tTime.wDay); sRet.Replace("DD",Newchar); sprintf(Newchar,"%02d\0",tTime.wMonth); sRet.Replace("MM",Newchar); sprintf(Newchar,"%02d\0",tTime.wHour); sRet.Replace("HH",Newchar); sprintf(Newchar,"%03d\0",tTime.wMilliseconds); sRet.Replace("MLS",Newchar); sprintf(Newchar,"%02d\0",tTime.wMinute); sRet.Replace("MI",Newchar); sprintf(Newchar,"%02d\0",tTime.wSecond); sRet.Replace("SS",Newchar); return sRet; } /* CDateTime类 */ CHDateTime::CHDateTime() { m_DateTime = GetNow(); DecoderTime(); } CHDateTime::CHDateTime(const TDateTime dt) { m_DateTime = dt; DecoderTime(); } CHDateTime::~CHDateTime() { } CHDateTime & CHDateTime::operator =(const TDateTime dt) { m_DateTime = dt; DecoderTime(); return *this; } CHDateTime::operator const TDateTime() { return m_DateTime; } bool CHDateTime::operator == (const TDateTime dt) { return ( m_DateTime == dt); } CHDateTime& CHDateTime::operator = (CHDateTime & cdt) { m_DateTime = cdt; DecoderTime(); return *this; } void CHDateTime::DecoderTime() { DecodeDateTime(m_DateTime,&tTime.wYear,&tTime.wMonth,&tTime.wMonth,&tTime.wHour,&tTime.wMinute,&tTime.wSecond,&tTime.wMilliseconds); } DWORD CHDateTime::Year() { return tTime.wYear; } DWORD CHDateTime::Month() { return tTime.wMonth; } DWORD CHDateTime::Day() { return tTime.wDay; } DWORD CHDateTime::Hour() { return tTime.wHour; } DWORD CHDateTime::Minute() { return tTime.wMinute; } DWORD CHDateTime::Second() { return tTime.wSecond; } DWORD CHDateTime::MilliSeconds() { return tTime.wMilliseconds; } SYSTEMTIME CHDateTime::Time() { return tTime; } TDateTime CHDateTime::Date() { int nDay = int(m_DateTime); return (double)nDay; } CString CHDateTime::ToString(const char * cFormat) { return FormatDateTime(cFormat,m_DateTime); }