AddTime.c

Go to the documentation of this file.

#include "libFireBird.h"
 
dword AddTime(dword date, int add) //add minutes to the day
{
  TRACEENTER();
 
  word                  day;
  short                 hour, min;
 
  day = (date >> 16) & 0xffff;
  hour= (date >> 8) & 0xff;
  min = (date) & 0xff;
 
  min += add % 60;
  if(min < 0)
  {
    hour-=1;
    min+=60;
  }
  else if(min > 59)
  {
    hour+=1;
    min-=60;
  }
 
  hour += add / 60;
 
  if(hour < 0)
  {
    day-=1;
    hour+=24;
  }
  else
  {
    while(hour > 23)
    {
      day+=1;
      hour-=24;
    }
  }
 
  TRACEEXIT();
  return ((day<<16)|(hour<<8)|min);
}