日期时间转换格式

Question

请问各位大哥怎样才能计算出两个日期之间相差多少天？
比如计算2003-11-25 至 2003-11-20 之间相差5天。

Answer 1

uses
DateUtils;function DaysBetween(const ANow, AThen: TDateTime): Integer;

Answer 2

uses
DateUtils;两日期两减showmessage(inttostr(Trunc(datetimepicker1.Date)-Trunc(datetimepicker2.Date)));

Answer 3

var n:integer;
begin
  n:=daysbetween(DateTimePicker1.DateTime,DateTimePicker2.DateTime);
end;

Answer 4

楼上正解SQL数据库中：datediff(day,'1999-10-10','1999-10-12')

Answer 5

uses
DateUtils;function DaysBetween(const ANow, AThen: TDateTime): Integer;