| [Overview][Constants][Procedures and functions][Index] |
Check whether two TDateTimes are only a number of days apart
Source position: dateutil.inc line 246
function WithinPastDays( |
const ANow: TDateTime; |
const AThen: TDateTime; |
const ADays: Integer |
):Boolean; |
ANow |
|
First moment in time |
AThen |
|
Second moment in time |
ADays |
|
Number of days to check |
True if ANow and Athen are only ADays apart, false otherwise
WithinPastDays compares the timestamps ANow and AThen and returns True if the difference between them is at most ADays days apart, or False if they are further apart.
| Remark: | Since this function uses the DaysBetween function to calculate the difference in days, this means that fractional days do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half days apart, the result will also be True |
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Check whether two TDateTimes are only a number of years apart |
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Check whether two TDateTimes are only a number of months apart |
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Check whether two TDateTimes are only a number of weeks apart |
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Check whether two TDateTimes are only a number of hours apart |
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Check whether two TDateTimes are only a number of minutes apart |
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Check whether two TDateTimes are only a number of seconds apart |
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Check whether two TDateTimes are only a number of milliseconds apart |
Program Example50; { This program demonstrates the WithinPastDays function } Uses SysUtils,DateUtils; Procedure Test(ANow,AThen : TDateTime; ADays : Integer); begin Write(DateTimeToStr(AThen),' and ',DateTimeToStr(ANow)); Write(' are within ',ADays,' days: '); Writeln(WithinPastDays(ANow,AThen,ADays)); end; Var D1,D2 : TDateTime; Begin D1:=Now; D2:=Today-23/24; Test(D1,D2,1); D2:=Today-1; Test(D1,D2,1); D2:=Today-25/24; Test(D1,D2,1); D2:=Today-26/24; Test(D1,D2,5); D2:=Today-5.4; Test(D1,D2,5); D2:=Today-2.5; Test(D1,D2,1); Test(D1,D2,2); Test(D1,D2,3); End.