convert GMT seconds to date time format-vc++ source code.

Recently in the Writing PE analysis tool, need to convert timedatestamp field value for date time format, this is VC + + source.
Converts the number of seconds in GMT time to date time format
CTime getgmtdatetime (Long Value)
... {
GMT time starting from January 1, 1970, first as the initial value of the assignment
int year=1970, month=1, Day=1;
int hour=0, min=0, sec=0, msec=0;
Temporary variable
int iyear=0, iday=0;
int ihour=0, imin=0, isec=0;
Calculate the year the file was created
Iyear=value/(365*24*60*60);
Year=year+iyear;
How many days to calculate a file except to create an entire year
iday= (Value% (365*24*60*60))/(24*60*60);
Calculate the number of years in a leap year
int rint=0;
for (int i=1970;i<year;i++)
... {
if ((i% 4) ==0)
rint=rint+1;
}
Calculate when the file was created (when)
Ihour= ((Value% (365*24*60*60))% (24*60*60))/(60*60);
Hour=hour+ihour;
Calculated file creation time (in minutes)
Imin= ((Value% (365*24*60*60))% (24*60*60))% (60*60))/60;
Min=min+imin;
Calculate how long a file was created (seconds)
Isec= ((Value% (365*24*60*60))% (24*60*60))% (60*60))% 60;
Sec=sec+isec;

CTime T (year,month,day,hour,min,sec);
CTime T1;
t1=t+ (iday-rint) *24*60*60;
return t1;
}

Call
void Cgmtprodlg::onok ()
... {
CTime T1;
708992537 is the number of seconds
T1=getgmtdatetime (708992537);
Char rdate[20]= ... {0};
Char rtime[20]= ... {0};
Isolate date
wsprintf (Rdate, "%04u-%02u-%02u", T1. GetYear (), T1. GetMonth (), T1. Getday ());
Isolate the time
wsprintf (Rtime, "%02u:%02u:%02u", T1. Gethour (), T1. Getminute (), T1. Getsecond ());
Show the date and time.
M_date=rdate;
M_time=rtime;
UpdateData (FALSE);
}