One way might be to convert the number to POSIXct by scaling it based
that POSIXct is from 1970 and your number is from 1601. So if you
subtract the difference between 1601 and 1970 then you should have a
compliant number for R:
# read your number
x <- 12345678901234567890 # big number (your 64-bit time)
x.sec <- x / 10^9 # convert to seconds
xBase <- unclass(as.POSIXct('1601-1-1')) # your time base, relative to 1970
x.sec <- x.sec - abs(xBase) # scale to 1970
x.time <- structure(x.sec, class=c("POSIXt", "POSIXct")) # convert to POSIXct
On 10/19/06, Derek Eder <[EMAIL PROTECTED]> wrote:
> Windows-32 has a time structure called FILETIME, a 64-bit value
> representing the number of 100-nanosecond intervals since January 1,
> 1601 (UTC). That is not a typo, the year is 1601.
>
> Does anyone have a clue(or algorhithm)for how this is converted to
> something a little more POSIX-like ?
>
> Thank you,
>
> Derek
>
> --
> Derek N. Eder
>
> Gothenburg University
> VINKLA - Vigilance and Neurocognition laboratory
>
> SU/Sahlgrenska
> Utvecklingslab 1, Med
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> SE 413 45 Göteborg (Gothenburg)
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>
> +46 (031)* 342 8261 (28261 inom Sahlgrenska)
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>
> * omit the 0 when calling from outside Sweden
>
> personal web page: www.derek-eder.org
>
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--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem you are trying to solve?
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