WithinPastMilliSeconds¶

Check whether two TDateTimes are only a number of milliseconds apart.

Declaration¶

Source position: dateutil.inc line 273

function WithinPastMilliSeconds(const ANow: TDateTime; 
                               const AThen: TDateTime; 
                               const AMilliSeconds: Int64) : Boolean;

Arguments¶

Name	Description
ANow	First moment in time.
AThen	Second moment in time.
AMilliSeconds	Number of milliseconds to check.

Function result¶

True if ANow and Athen are only AMilliSeconds apart, false otherwise.

Description¶

WithinPastMilliSeconds compares the timestamps ANow and AThen and returns True if the difference between them is at most AMilliSeconds milliseconds apart, or False if they are further apart.

Remark:

Since this function uses the MilliSecondsBetween function to calculate the difference in milliseconds, this means that fractional milliseconds do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half milliseconds apart, the result will also be True

See also¶

Name	Description
WithinPastYears	Check whether two TDateTimes are only a number of years apart.
WithinPastMonths	Check whether two TDateTimes are only a number of months apart.
WithinPastWeeks	Check whether two TDateTimes are only a number of weeks apart.
WithinPastDays	Check whether two TDateTimes are only a number of days apart.
WithinPastHours	Check whether two TDateTimes are only a number of hours apart.
WithinPastMinutes	Check whether two TDateTimes are only a number of minutes apart.
WithinPastSeconds	Check whether two TDateTimes are only a number of seconds apart.

Example¶

Program Example54;

{ This program demonstrates the WithinPastMilliSeconds function }

Uses SysUtils,DateUtils;

Procedure Test(ANow,AThen : TDateTime; AMilliSeconds : Integer);

begin
 Write(TimeToStr(AThen),' and ',TimeToStr(ANow));
 Write(' are within ',AMilliSeconds,' milliseconds: ');
 Writeln(WithinPastMilliSeconds(ANow,AThen,AMilliSeconds));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Now;
  D2:=D1-(0.9*OneMilliSecond);
  Test(D1,D2,1);
  D2:=D1-(1.0*OneMilliSecond);
  Test(D1,D2,1);
  D2:=D1-(1.1*OneMilliSecond);
  Test(D1,D2,1);
  D2:=D1-(2.5*OneMilliSecond);
  Test(D1,D2,1);
  Test(D1,D2,2);
  Test(D1,D2,3);
End.