[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 263

`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: May 14 2021