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Источник: http://palleagermark.blogspot.com/20...of-months.html
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Here is a small algorithm to transform a date into a number of months from a base date. You can for example use this if you need to create a report with numbers places in a column per month starting with the month of a specific date.

The algorithm to transform the date into a month is this:

if (columDate < dateEndYr(offSetDate)) 
{ 
    column = mthOfYr(columDate) - mthOfYr(offSetDate) + 1; 
} 
else 
{ 
    column = 12 - mthOfYr(offSetDate) + mthOfYr(columDate) +1; 
}

And here is a job to illustrate the useage:

static void date2Column(Args _args)
{ 
    Date offsetdate; 
    Date columDate; 
    int column; 
    int counter; 
;

    offSetDate = 30\09\2008; 
    columDate = offSetDate;
    while (counter <= 11) 
    { 
        counter++;
        // The actual algorithm --> 
        if (columDate < dateEndYr(offSetDate)) 
        { 
            column = mthOfYr(columDate) - mthOfYr(offSetDate) + 1; 
        } 
        else 
        { 
            column = 12 - mthOfYr(offSetDate) + mthOfYr(columDate) +1; 
        } 
        // The actual algorithm <--
        print strFmt("Date: %1 Month: %2", columDate, column); 
        columDate = dateMthFwd(columDate, 1); 
    } 
    pause;
}