[Overview][Constants][Procedures and functions] | Reference for unit 'dateutils' (#rtl) |
Compare 2 dates, disregarding the time of day
Source position: dateutil.inc line 352
function CompareDate( |
const A: TDateTime; |
const B: TDateTime |
A |
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First date to compare |
B |
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Second date to compare |
A negative number if date A is before B, zero if they are equal, or positive if A is after B.
CompareDate compares the date parts of two timestamps A and B and returns the following results:
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Compares two times of the day, disregarding the date part. |
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Compare 2 dates, taking into account the time of day |
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Check whether two TDateTime values have the same date part. |
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Check whether two TDateTime values have the same time part. |
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Check whether two TDateTime values have the same date and time parts. |
Program Example99; { This program demonstrates the CompareDate function } Uses SysUtils,DateUtils; Const Fmt = 'dddd dd mmmm yyyy'; Procedure Test(D1,D2 : TDateTime); Var Cmp : Integer; begin Write(FormatDateTime(Fmt,D1),' is '); Cmp:=CompareDate(D1,D2); If Cmp<0 then write('earlier than ') else if Cmp>0 then Write('later than ') else Write('equal to '); Writeln(FormatDateTime(Fmt,D2)); end; Var D,N : TDateTime; Begin D:=Today; N:=Now; Test(D,D); Test(N,N); Test(D+1,D); Test(D-1,D); Test(D+OneSecond,D); Test(D-OneSecond,D); Test(N+OneSecond,N); Test(N-OneSecond,N); End.
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