WithinPastMilliSeconds

Check whether two datetimes are only a number of milliseconds apart

Declaration

Source position: dateutil.inc line 248

function WithinPastMilliSeconds(

const ANow: TDateTime;

const AThen: TDateTime;

const AMilliSeconds: Int64

):Boolean;

Arguments

`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

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

Notes

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