WithinPastHours¶

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

Declaration¶

Source position: dateutil.inc line 270

function WithinPastHours(const ANow: TDateTime; const AThen: TDateTime; 
                        const AHours: Int64) : Boolean;

Arguments¶

Name	Description
ANow	First moment in time.
AThen	Second moment in time.
AHours	Number of hours to check.

Function result¶

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

Description¶

WithinPastHours compares the timestamps ANow and AThen and returns True if the difference between them is at most AHours hours apart, or False if they are further apart.

Remark:

Since this function uses the HoursBetween function to calculate the difference in Hours, this means that fractional hours do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half hours 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.
WithinPastMinutes	Check whether two TDateTimes are only a number of minutes apart.
WithinPastSeconds	Check whether two TDateTimes are only a number of seconds apart.
WithinPastMilliSeconds	Check whether two TDateTimes are only a number of milliseconds apart.

Example¶

Program Example51;

{ This program demonstrates the WithinPastHours function }

Uses SysUtils,DateUtils;

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

begin
 Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow));
 Write(' are within ',AHours,' hours: ');
 Writeln(WithinPastHours(ANow,AThen,AHours));
end;

Var
  D1,D2 : TDateTime;

Begin
  D1:=Now;
  D2:=D1-(59*OneMinute);
  Test(D1,D2,1);
  D2:=D1-(61*OneMinute);
  Test(D1,D2,1);
  D2:=D1-(122*OneMinute);
  Test(D1,D2,1);
  D2:=D1-(306*OneMinute);
  Test(D1,D2,5);
  D2:=D1-(5.4*OneHour);
  Test(D1,D2,5);
  D2:=D1-(2.5*OneHour);
  Test(D1,D2,1);
  Test(D1,D2,2);
  Test(D1,D2,3);
End.