Unit 'DateUtils' Package
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WithinPastMilliSeconds

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

Declaration

Source position: dateutil.inc line 265

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

See also

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.

Documentation generated on: Jul 24 2023