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Calculate the approximate number of weeks between two TDateTime values.
Source position: dateutil.inc line 286
function WeekSpan( 
const ANow: TDateTime; 
const AThen: TDateTime 
):Double; 
ANow 

First moment in time 
AThen 

Second moment in time 
Number (fractions included) of weeks between ANow and AThen
WeekSpan returns the number of weeks between ANow and AThen, including any fractional parts of a week.

Calculate the approximate number of years between two TDateTime values. 


Calculate the approximate number of months between two TDateTime values. 


Calculate the approximate number of days between two TDateTime values. 


Calculate the approximate number of hours between two TDateTime values. 


Calculate the approximate number of minutes between two TDateTime values. 


Calculate the approximate number of seconds between two TDateTime values. 


Calculate the approximate number of milliseconds between two TDateTime values. 


Calculate the number of whole weeks between two TDateTime values 
Program Example57; { This program demonstrates the WeekSpan function } Uses SysUtils,DateUtils; Procedure Test(ANow,AThen : TDateTime); begin Write('Number of weeks between '); Write(DateToStr(AThen),' and ',DateToStr(ANow)); Writeln(' : ',WeekSpan(ANow,AThen)); end; Var D1,D2 : TDateTime; Begin D1:=Today; D2:=Today7; Test(D1,D2); D2:=Today8; Test(D1,D2); D2:=Today14; Test(D1,D2); D2:=Today35; Test(D1,D2); D2:=Today36; Test(D1,D2); D2:=Today17; Test(D1,D2); End.