Advance or retard a hzXDate by a number of months. Returns: None

Declared in file: hzDate.h
Defined in file : hzDate.cpp

Function Logic:

Function body:

void hzXDate::altmon (int32_t nounits)
{
   //  Advance or retard a hzXDate by a number of months.
   //  
   //  Arguments: 1) nounits Number of units (months) into future/past
   //  Returns: None
   uint32_t    days ;      //  Used by date - no of days conversion
   uint32_t    Y ;         //  Year part
   uint32_t    M ;         //  Month part
   uint32_t    D ;         //  Day part
   days = m_hour/24;
   _datefromdays(Y, M, D, days) ;
   if (nounits > 0)
   {
       for (; nounits > 0; nounits--)
       {
           if (nounits > 12)
               { Y++ ; nounits -= 11;continue ; }
           M = M == 12?1: M + 1;
       }
       if (D > monlen(Y, M))
           D = monlen(Y, M) ;
   }
   if (nounits < 0)
   {
       for (; nounits < 0; nounits++)
       {
           if (nounits < -12)
               { Y-- ; nounits += 11;continue ; }
           M = M == 1? 12:M - 1;
       }
       if (D > monlen(Y, M))
           D = monlen(Y, M) ;
   }
   _daysfromdate(days, Y, M, D) ;
   days *= 24;
   days += (m_hour%24);
   m_hour = days ;
}