[DUG] Reading binary data as date/time from registry

[Jan Bakuwel]

Hi,

Phil: the double returned is almost zero but not quite:
5.02935870345123E-300. I don't know which (IEEE?) representation Delphi
is using to store floating point numbers.... but surely it's not zero.
What is interesting though is that even though I assume the correct bit
pattern gets into the double (reading 8 bytes from the registry into a
double can only be done in so many ways), that Delphi is - apparently? -
interpreting it as zero as implicated by a date of 30/12/1899.

John: Thanks for the suggestion to look into FileDate/Times - will
report back what I find out.

Thanks to all for helping out with my Friday Trivia :-)

wish you a good weekend,
Jan


On 14/05/10 12:40, John Bird wrote:
> I am pretty certain that 30/12/1899 is a unique start point for Delphi - 
> other systems (Unix and Windows) look to start at 1970 or 1980.   I am 
> guessing as I haven't dealt with registry dates that you need to do 
> something similar to a file datestamp - FileDatetoDateTime and/or 
> FileTimeToSystemTime API
>
> I saw some code examples at
>
> http://www.efg2.com/Lab/Library/Delphi/DatesAndTimes/index.html
>
> which appear to back this up  (about 1/4 way down the page).   Is the date 
> value likely to be a windows integer date/timestamp?
>
> John 
>
>
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