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

# MilliSecondsBetween

Calculate the number of whole milliseconds between two DateTime values.

## Declaration

Source position: dateutil.inc line 263

 function MilliSecondsBetween( const ANow: TDateTime; const AThen: TDateTime ):Int64;

## Arguments

 ANow First moment in time AThen Second moment in time

## Function result

Number of milliseconds between ANow and AThen

## Description

MillisSecondsBetween returns the number of whole milliseconds between ANow and AThen. This means a fractional part of a millisecond is dropped.

 YearsBetween Calculate the number of whole years between two DateTime values MonthsBetween Calculate the number of whole months between two DateTime values WeeksBetween Calculate the number of whole weeks 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.

## Example

```Program Example62;

{ This program demonstrates the MilliSecondsBetween function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime);

begin
Write('Number of milliseconds between ');
Write(TimeToStr(AThen),' and ',TimeToStr(ANow));
Writeln(' : ',MilliSecondsBetween(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.
```