| [Overview][Constants][Procedures and functions][Index] |
Check whether two datetimes are only a number of milliseconds apart
Source position: dateutil.inc line 250
function WithinPastMilliSeconds( |
const ANow: TDateTime; |
const AThen: TDateTime; |
const AMilliSeconds: Int64 |
):Boolean; |
ANow |
|
First moment in time |
AThen |
|
Second moment in time |
AMilliSeconds |
|
Number of milliseconds to check |
True if ANow and Athen are only AMilliSeconds apart, false otherwise
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 |
|
Check whether two datetimes are only a number of years apart |
|
|
Check whether two datetimes are only a number of months apart |
|
|
Check whether two datetimes are only a number of weeks apart |
|
|
Check whether two datetimes are only a number of days apart |
|
|
Check whether two datetimes are only a number of hours apart |
|
|
Check whether two datetimes are only a number of minutes apart |
|
|
Check whether two datetimes are only a number of seconds apart |
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.