MilliSecondSpan

Calculate the approximate number of milliseconds between two DateTime values.

Declaration

Source position: dateutil.inc line 276

function MilliSecondSpan(

const ANow: TDateTime;

const AThen: TDateTime

):Double;

Arguments

`ANow`		First moment in time
`AThen`		Second moment in time

Function result

Number (fractions included) of seconds between ANow and AThen

Description

MilliSecondSpan returns the number of milliseconds between ANow and AThen. Since millisecond is the smallest fraction of a TDateTime indication, the returned number will always be an integer value.

YearSpan		Calculate the approximate number of years between two DateTime values.
MonthSpan		Calculate the approximate number of months between two DateTime values.
WeekSpan		Calculate the approximate number of weeks between two DateTime values.
DaySpan		Calculate the approximate number of days between two DateTime values.
HourSpan		Calculate the approximate number of hours between two DateTime values.
MinuteSpan		Calculate the approximate number of minutes between two DateTime values.
SecondSpan		Calculate the approximate number of seconds between two DateTime values.
MilliSecondsBetween		Calculate the number of whole milliseconds between two DateTime values.

Example

Program Example70;

{ This program demonstrates the MilliSecondSpan function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
 Write('Number of milliseconds between ');
 Write(TimeToStr(AThen),' and ',TimeToStr(ANow));
 Writeln(' : ',MilliSecondSpan(ANow,AThen));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Now;
  D2:=D1-(0.9*OneMilliSecond);
  Test(D1,D2);
  D2:=D1-(1.0*OneMilliSecond);
  Test(D1,D2);
  D2:=D1-(1.1*OneMilliSecond);
  Test(D1,D2);
  D2:=D1-(2.5*OneMilliSecond);
  Test(D1,D2);
End.