Is that not about the same question you just closed ?
if you want to have the nb of days, hours, min you can use
procedure DecodeDate(Date: TDateTime; var Year, Month, Day: Word);
in SysUtils
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Question
Return number ofdays and hours between date
we need an function to returno number of hours (abouve 24 hours) using TDateTime
Sample:
dt_1: TDateTime;
dt_2: TDateTime;
dt_1 := StrToDateTime('12/28/2009 00:00');
dt_2 := StrToDateTime('12/30/2009 13:15');
dt_2 - dt_1 = return 3 days and 1 hours and 15 minutes
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Answers
Ah, actually by looking again at this thread, I see that what you need is not exactly DecodeDate but
DecodeDateTime(const AValue: TDateTime; out AYear: Word; out AMonth: Word; out ADay: Word; out AHour: Word; out AMinute: Word; out ASecond: Word; out AMilliSecond: Word);
Var
Year, Month, Day: Word;
Hour, Min, Sec, MilSec: Word;
begin
DecodeDateTime( dt_2 - dt_1, Year, Month, Day, Hour, Min, Sec, MilSec );
end;
Or DecodeTime + nb of full days not decoded (=8 if 1week+1day) :
Var
Days: Word;
Hour, Min, Sec, MilSec: Word;
begin
DecodeDateTime( dt_2 - dt_1, Hour, Min, Sec, MilSec );
Days:=Trunc( dt_2-dt_1);
end;
Now you have about all possible solutions, choose the best suited for your needs
A TDateTime is the number of days since some date (can't remember what date but that is not important)
So i you have two TDateTime d1 and d2 the number of days between them is Trunc(d2-d1)
what is left (ie frac(d2-d1) is the number hours:min...
The fractional part represent the time,
So if f = frac(d2-d1) you have:
Hours = trunc(f*24)
Minutes = trunc(f*24*60)-Hours*60
Seconds = trunc(f*24*60)-Hours*60-Mi
I have assumed that d2 is larger than d1, if not you can swap them and then use the above.
By the way if you just want to display the difference you can also use IntToStr(trunc(d2-d1) + " days " + TimeToString(d2-d1)
(I think it was called TimeToString but something like that) again d2 should be larger than d1.
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by: rfwoolfPosted on 2009-11-03 at 09:30:31ID: 25731329
Add Dateutils unit to your uses list
Use Daysbetween,
Hours between,
Minutesbetween functions
or look at the Dateutils methods list in the help file for a full list of date and time handling functions