delphi - IncHour procedure in DateUtils -

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I have the following bit of Delphi 7 code to increase the TDateTime value for one hour, for some reason it does not work < / P> 

  STATHMO.Lines.ed ('first' + datetimeostrat (difference)); IncHour (dtval, 1); // Add an hour for the DST status quo. Lines Add ('After' + DateTimestrasse (difference));

The content of StatusMemo after code is run: 

  ago 6/24/2009 5:35:40 AM 6/24/2009 5:35 : 40 AM

It works for Inc as if it is not working. I tried to use IncMinute (dtval, 60), and got the same result, what am I missing?

incHour gives incremental value, it does not update passed in the variable

So you need to: 

  feast: = inkhor (decimal, 1);

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