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Article #16822: How can I determine the week number of a given day in the year?

 Question and Answer Database

FAQ1822D.txt   How can I determine the week number of a given day in the year?
Category   :Miscellaneous
Platform    :All
Product    :All 32 bit  

Question:
How can I determine the week number of a given day 
in the year?


Answer:
This is a highly debated subject, as the first week of the 
year may be considered to be before or after Jan 1. The 
following function provides a starting point for WeekOfYear 
calculations.

Example:

function WeekOfYear(ADate : TDateTime) : word;
var
  day : word;
  month : word;
  year : word;
  FirstOfYear : TDateTime;
begin
  DecodeDate(ADate, year, month, day);
  FirstOfYear := EncodeDate(year, 1, 1);
  Result := Trunc(ADate - FirstOfYear) div 7 + 1;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage(IntToStr(WeekOfYear(Date)));
end;



7/16/98 4:31:28 PM
 

Last Modified: 01-SEP-99