Don't know that much about it myself, but there are no functions for this
that I know of. There are third party UDF's though and that is probably the
best way forward. We are still on Interbase 5.6 and I think the latest is
7.5, so that might explain something.
RBS
-----Original Message-----
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 23:30
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Dealing with dates in the format yyyymmdd
I know nothing of Interbase, but cannot imagine that it does not have a
set of date manipulation functions.
RB Smissaert wrote:
If I try to convert the integer Interbase date with standard SQL I get
something like this:
CAST(CAST((E.ADDED_DATE - (CAST(E.ADDED_DATE / 10000 AS INT) * 10000)) - "
&
_ "CAST((E.ADDED_DATE - CAST(E.ADDED_DATE / 10000 AS INT) * 10000) AS INT)
AS INT) || '/' || " & "CAST((E.ADDED_DATE - CAST(E.ADDED_DATE / 10000 AS
INT) * 10000) / 100 AS INT) || '/' || " & "CAST(E.ADDED_DATE / 10000 AS
INT) AS VARCHAR(10))
But I haven't got it working yet.
RBS
-----Original Message-----
From: RB Smissaert [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 21:05
To: sqlite-users@sqlite.org
Subject: RE: [sqlite] Dealing with dates in the format yyyymmdd
Is the date function as in:
Function Overview
Five date and time functions are available, as follows:
1. date( timestring, modifier, modifier, ...) ?
Will give that a go.
RBS
-----Original Message-----
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 20:46
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Dealing with dates in the format yyyymmdd
Why not use Interbase to transform the date into a character string,
like an ISI8601 date or yymmdd, dd-mm-yyyy etc and then use the Sqlite
date function to insert it into Sqlite?
RB Smissaert wrote:
It looks like Interbase uses a traditional date format based on an epoch.
It just does year * 10000 + month * 100 + day
I suppose I could something like this in SQL:
((lIBDate - ((lIBDate \ 10000) * 10000 + ((lIBDate - (lIBDate \ 10000) *
10000) \ 100) * 100)) + _
(153 * (((lIBDate - (lIBDate \ 10000) * 10000) \
100) + _
12 * ((14 - ((lIBDate - (lIBDate \
10000)
* 10000) \ 100)) / 12) - 3) + 2) / 5 + _
((lIBDate \ 10000) + 4800 - ((14 -
((lIBDate - (lIBDate \ 10000) * 10000) \ 100)) / 12)) * _
365 + ((lIBDate \ 10000) + 4800 - _
((14 - ((lIBDate - (lIBDate \
10000) * 10000) \ 100)) / 12)) / 4 - 32083) - _
2415033
Except it looks a mess and it is one day out, I take it due to not
declaring
variables as long as in my previously posted function.
RBS
-----Original Message-----
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 20:03
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Dealing with dates in the format yyyymmdd
It looks like Interbase uses a traditional date format based on an
epoch. That is a system where a base date is set (the epoch) and the
date is stored as an offset from that date. It is stored as an integer.
Sqlite uses a similar system, except that it uses a special epoch
compatible with other calendars and incorporates the time, storing all
of it in a 64 bit floating point format.
You should be able to translate the date into a yymmdd format of some
description from Interbase and use that to insert into Sqlite. The ISO
8601 date and time format is a widely used standard.
RB Smissaert wrote:
What do you mean by "integer format yyymmdd"?
This is an Interbase database and the Create statement of such a field
would
be like this:
CREATE TABLE ENTRY(ADDED_DATE INTEGER, etc.
Not sure what an epoch is, not sure how else to describe it.
So, do you reckon I could, given the fact that I have an integer number
in
SQLite like 20061203, convert this in SQLite to another integer number
that
would give the number of days since 31 December 1899? Or do you think
that
I
could make accurate dates comparisons in SQLite with 20061203 etc.? I
suppose the trouble will be with weeks and days, years and months would
be
fine. So, for example it won't be that simple to say if 20061203 is more
than 10 weeks past 20060920, whereas it will be easy to calculate that it
is
less than 3 months passed that date.
Is there such a thing as the VB/VBA DateSerial in SQLite? This means
given
the year, the month number and day number you can make a date?
RBS
-----Original Message-----
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 18:23
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Dealing with dates in the format yyyymmdd
What do you mean by "integer format yyymmdd"? Is it an integer based on
an epoch or is it a number like 20061203 stored in a 32 bit word?
We use Sqlite format dates and times and thereby get good SQL capability
and have a small library of date function which interface into Unix and
Windows date and time retrieval APIs. A couple of simple Sqlite custom
functions to do some date manipulation made the SQL simpler.
Custom date functions are very easy to implement using Sqlite because
you can use the Sqlite date routines and style as a basis.
The Sqlite epoch based date format is elegant because it permits you to
present date and time not only according to any time zone but to comply
with more than just the Gregorian calendar - with Middle Eastern and
Oriental ones should the need arise.
RB Smissaert wrote:
Trouble is I need to import dates from Interbase that have the integer
format yyyymmdd. How would I convert that (at import) to the SQLite date
format? I do the import via an ADO recordset and then move the data via
SQLite inserts.
RBS
-----Original Message-----
From: John Stanton [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 17:01
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Dealing with dates in the format yyyymmdd
Why not use the internal Sqlite date format. Then date processing is
straight forward and you can use the conversion routines to present it
in the various national and ISO formats.
Sqlite uses a very correct date storage format based on an epoch way
back in antiquity so that you can present it in any national format.
Using the internal format date comparison is just a numeric compare,
which is efficient.
If you need any special date presentation you can add a custome function
to Sqlite to achieve it from your SQL statement.
RB Smissaert wrote:
Just thought of one reason why it I need something else in SQLite than
yyyymmdd in the date field and that is because I need date comparisons
between different tables. So, I need to do: is fieldA + x days >
fieldB?
etc.
This will be difficult with the yyyymmdd format. I could of course
update
all the date fields in a VBA loop, but that might be a bit slow. So, if
anybody has an idea how to convert integer yyyymmdd to the Excel date
format
in SQLite I would be interested.
RBS
-----Original Message-----
From: RB Smissaert [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 15:37
To: sqlite-users@sqlite.org
Subject: RE: [sqlite] Dealing with dates in the format yyyymmdd
I think it is easier to do this in VBA and as the main work is done in
a
VBA
array it is quite fast as well. Not as elegant maybe as doing it in
SQLite,
but it will do.
RBS
-----Original Message-----
From: Fred Williams [mailto:[EMAIL PROTECTED]
Sent: 03 December 2006 14:41
To: sqlite-users@sqlite.org
Subject: RE: [sqlite] Dealing with dates in the format yyyymmdd
Is there a reason you can use Excel's "Format Cells" to accomplish what
you wish? Enter a "Custom" format of "yyyy\mm\dd" in a cell and enter
"=today()" as a value in that cell. Have not fooled with Excel much
lately, but I think you can even format a spreadsheet programmatically.
Fred
-----Original Message-----
From: RB Smissaert [mailto:[EMAIL PROTECTED]
Sent: Sunday, December 03, 2006 8:21 AM
To: sqlite-users@sqlite.org
Subject: [sqlite] Dealing with dates in the format yyyymmdd
When moving data from Interbase to SQLite I have to convert
integer dates in
the format yyyymmdd to Excel dates. These are integer numbers
counting the
days past 31 December 1899. With substr I can make it
dd/mm/yyyy (I am in
the UK and that is the normal way to format dates) but the
problem is it
will be displayed in Excel like mm/dd/yyyy if that would be a
possible date.
This is due to the US date format of Excel.
So, would it be possible in SQLite to make a date format like this:
dd/mmm/yyyy so that would be 03/dec/2006
This would prevent Excel from putting the month first.
or alternatively make it the Excel integer date format so the
above date
would be: 39054
I could handle the date formatting in VBA, but I would like
to do as much as
possible in SQLite as it will be faster and it would keep the
code neater.
Thanks for any advice.
RBS
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