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Calculate the approximate number of weeks between two DateTime values.
Source position: dateutil.inc line 273
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 DateTime values. 


Calculate the approximate number of months between two DateTime values. 


Calculate the approximate number of days between two DateTime values. 


Calculate the approximate number of hours between two DateTime values. 


Calculate the approximate number of minutes between two DateTime values. 


Calculate the approximate number of seconds between two DateTime values. 


Calculate the approximate number of milliseconds between two DateTime values. 


Calculate the number of whole weeks between two DateTime 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.