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

WithinPastMilliSeconds

Check whether two TDateTimes are only a number of milliseconds apart

Declaration

Source position: dateutil.inc line 250

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: Jun 23 2021