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1/1/1990 and 12/30/1899 default dates

Posted on 2000-05-01
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Last Modified: 2012-08-14
When using a script, or the a dll, to add a new record to the db. Dates are automatically defaulted to 12/30/1899 when only time is specifed. So, for instance if i have code:
dbrst("dttime") = time()
Then it will automatically append 12/30/1899 in there.
But the default date for the database is 1/1/1990. So, I've been having date comparision problems.. Is this a known problem? Could it be our ado? We have the latest version.

I'm really stumped. Please help.
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Question by:thyd
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Expert Comment

by:manchula
ID: 2768035
This is not your ADO problem. Why don't you try this?

dbrst("dttime") = Date() + Time()
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 2768612
I confirm that you should add the date part manually.
In fact, the 1/1/1990 corresponds to
31/12/1899 24:00. While supplying a time, only that part is replaced, and you end up with the 31/12/1899 as date.
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Author Comment

by:thyd
ID: 2770051
Sorry, that's not what i'm looking for.
It's because in sql online help it states that the default is 1-1-1900.
And when using addnew function it appends 12-31-1899. But when using the insert function, or update function it appends 1-1-1900.

Please help.

Thanks..
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Accepted Solution

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Jon_Raymond earned 100 total points
ID: 2771940
SQL Server uses a different numeric base to store dates than VB does.  Dates are actually stored as integers.  In VB the base 0 equates to 12/31/1899 00:00:00, in SQL 0 equates to 1/1/1900 00:00:00.  In VB today's date converts to 36649; in SQL it's 36647.  I think this is the root of the problem.  If one procedure uses SQL processes to compute the date and another uses VB then the discrepancy will occur.
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by:Jon_Raymond
ID: 2771947
Correction: the VB 0 base is 12/30/1899 00:00:00
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Author Comment

by:thyd
ID: 2774142
Jon,

Is there a way to solve the problem?


Thanks...
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Expert Comment

by:Jon_Raymond
ID: 2775878
Good question.  I don't have a cover-all answer.  When I last delt with this I deliberately used 12/30/1899 as the zero date value, because all blank dates were appearing as that value.  So I queried for dates that were > 12/30/1899 instead of dates that were not null.  I haven't seen the situation you describe, but you probably have to deal with each circumstance.  You might be able to add 1/1/1990 to the time value, for example.  It depends on the situation.
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Author Comment

by:thyd
ID: 2777861
I'll accept your first comment, as an answer. We really didn't want to append extra values to the time.

Thanks for answering.

Thy
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