Solved

Days passed since..

Posted on 2004-04-27
8
276 Views
Last Modified: 2010-04-05
I need a function to give me how many days have passed
since a given data. It has to keep in mind about different
data formats.

Thanks.
0
Comment
Question by:bryan7
8 Comments
 
LVL 27

Accepted Solution

by:
kretzschmar earned 500 total points
ID: 10926022
>It has to keep in mind about different data formats.

just transform it into tdatetime

function DaysBetween(d1,d2 : TDateTime) : Integer;
begin
  result := Abs(trunc(d1-d2));
end;

meikl ;-)

0
 
LVL 12

Expert Comment

by:Ivanov_G
ID: 10926065

  yep, kretzschmar is right, but let me add something... you don't need the Abs function because ...

  TDateTime is real number. The integer part represent the days after 12/30/1899. So trunc(d1-d2) will give you the number of days... This can me negative value ...
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 10926088
>This can me negative value ...

i added abs, to avoid negative values :-))
0
Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 22

Expert Comment

by:Ferruccio Accalai
ID: 10926103
guys the DaysBetween function already exists in DateUtils.pas that gives the integer value of the difference between 2 dates...

also it contain DaySpan function that gets the difference included the frac part of entire day...

from Delphi help:

Call DaysBetween to obtain the difference, in days, between two TDateTime values.

DaysBetween counts only whole days. Thus, DaysBetween reports the difference between Dec 31, 1999 11:59 PM and Jan 1, 2000 11:58 PM as 0 because the difference is one minute short of an entire day.

Call DaySpan to obtain the difference, in days, between two TDateTime values. Unlike the DaysBetween function, which only counts whole days, DaySpan reports incomplete days as a fraction of an entire day.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 10926109
i know, f68 :-))
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 10926111
just to say, that DateUtils.pas is not on all delphi versions available
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 10926129
function DaySpan(d1,d2 : TDateTime) : Double;
begin
  result := Abs(d1-d2);
end;

meikl ;-)
0
 
LVL 3

Author Comment

by:bryan7
ID: 10926141
Ahh thanks, that was easier than I thought eheh.
EncodeTime will do the rest. Btw my delphi5 enterprise
doesn't include that unit :(

grats kretzs on the first working answer

Thanks all for the help :)
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Two types of users will appreciate AOMEI Backupper Pro: 1 - Those with PCIe drives (and haven't found cloning software that works on them). 2 - Those who want a fast clone of their boot drive (no re-boots needed) and it can clone your drive wh…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question