[Overview][Constants][Procedures and functions][Index] Reference for unit 'dateutils' (#rtl)

# WeeksBetween

Calculate the number of whole weeks between two DateTime values

## Declaration

Source position: dateutil.inc line 258

 function WeeksBetween( const ANow: TDateTime; const AThen: TDateTime ):Integer;

## Arguments

 ANow First moment in time AThen Second moment in time

## Function result

Number of whole weeks between ANow and AThen.

## Description

WeeksBetween returns the number of whole weeks between ANow and AThen. This means the fractional part of a Week is dropped.

 YearsBetween Calculate the number of whole years between two DateTime values MonthsBetween Calculate the number of whole months between two DateTime values DaysBetween Number of whole days between two DateTime values. HoursBetween Calculate the number of whole hours between two DateTime values. MinutesBetween Calculate the number of whole minutes between two DateTime values. SecondsBetween Calculate the number of whole seconds between two DateTime values. MilliSecondsBetween Calculate the number of whole milliseconds between two DateTime values.

## Example

```Program Example57;

{ This program demonstrates the WeeksBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
Write('Number of weeks between ');
Write(DateToStr(AThen),' and ',DateToStr(ANow));
Writeln(' : ',WeeksBetween(ANow,AThen));
end;

Var
D1,D2 : TDateTime;

Begin
D1:=Today;
D2:=Today-7;
Test(D1,D2);
D2:=Today-8;
Test(D1,D2);
D2:=Today-14;
Test(D1,D2);
D2:=Today-35;
Test(D1,D2);
D2:=Today-36;
Test(D1,D2);
D2:=Today-17;
Test(D1,D2);
End.
```