[Overview][Constants][Procedures and functions] |
Check whether two datetimes are only a number of years apart
Source position: dateutil.inc line 241
function WithinPastYears( |
const ANow: TDateTime; |
const AThen: TDateTime; |
const AYears: Integer |
):Boolean; |
ANow |
|
First moment in time |
AThen |
|
Second moment in time |
AYears |
|
Number of years to check |
Trueif ANowand Athenare only AYearsapart, falseotherwise
WithinPastYearscompares the timestamps ANowand AThenand returns Trueif the difference between them is at most AYearsyears apart, or Falseif they are further apart.
Remark: | Since this function uses the YearsBetweenfunction to calculate the difference in years, this means that fractional years do not count, and the fractional part is simply dropped, so for two dates actually 2 and a half years apart, the result will also be True |
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Check whether two datetimes are only a number of months apart |
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Check whether two datetimes are only a number of weeks apart |
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Check whether two datetimes are only a number of days apart |
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Check whether two datetimes are only a number of hours apart |
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Check whether two datetimes are only a number of minutes apart |
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Check whether two datetimes are only a number of seconds apart |
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Check whether two datetimes are only a number of milliseconds apart |
Program Example47; { This program demonstrates the WithinPastYears function } Uses SysUtils,DateUtils; Procedure Test(ANow,AThen : TDateTime; AYears : Integer); begin Write(DateToStr(AThen),' and ',DateToStr(ANow)); Write(' are within ',AYears,' years: '); Writeln(WithinPastYears(ANow,AThen,AYears)); end; Var D1,D2 : TDateTime; Begin D1:=Today; D2:=Today-364; Test(D1,D2,1); D2:=Today-365; Test(D1,D2,1); D2:=Today-366; Test(D1,D2,1); D2:=Today-390; Test(D1,D2,1); D2:=Today-368; Test(D1,D2,1); D2:=Today-1000; Test(D1,D2,1); Test(D1,D2,2); Test(D1,D2,3); End.