WithinPastHours

Check whether two TDateTimes are only a number of hours apart

Declaration

Source position: dateutil.inc line 247

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

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
WithinPastDays Check whether two TDateTimes are only a number of days apart
WithinPastMilliSeconds Check whether two TDateTimes are only a number of milliseconds apart
WithinPastMinutes Check whether two TDateTimes are only a number of minutes apart
WithinPastMonths Check whether two TDateTimes are only a number of months apart
WithinPastSeconds Check whether two TDateTimes are only a number of seconds apart
WithinPastWeeks Check whether two TDateTimes are only a number of weeks apart
WithinPastYears Check whether two TDateTimes are only a number of years 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.