Please help me find days between two dates.
I have two objects TDBDateEdit date1 and date2.
procedure Torder_form.date2Click(Sender: TObject);
var d3: TDateTime;
begin
d3:=date2.date - date1.date;
showmessage(datetostr(d3));
end.
I put to date1 = 07.10.2015
to date2 - 15.11.2015
Result must be: 39
But program gives me result: 07.02.1900
I found DaysBetween function. and I changed my codes like that
procedure Torder_form.date2Click(Sender: TObject);
var d3: TDateTime;
begin
d3:=DaysBetween(date2.date,date1.date);
showmessage(datetostr(d3));
end.
But programs says Result: 07.02.1900
You're trying to store a non-date value (the number of days between two dates) in a TDateTime
value. Since you don't want a date, use a double instead, and interpret it as a double:
var
DaysDiff: Double;
begin
DaysDiff := Date2.Date - Date1.Date;
ShowMessage(FloatToStr(DaysDiff));
end;
Better yet, use the functions in DateUtils
to do the work for you. If you need just whole days, use DaysBetween
:
var
DaysDiff: Integer;
begin
DaysDiff := DaysBetween(Date2.Date, Date1.Date);
ShowMessage(IntToStr(DaysDiff));
end;
If you need fractional (partial) days, use DaySpan
:
var
DaysDiff: Double;
begin
DaysDiff := DaySpan(Date2.Date, Date1.Date);
ShowMessage(FloatToStr(DaysDiff));
end;
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