[Armedbear-devel] single float representation and timing

Stas Boukarev stassats at gmail.com
Tue Jun 3 17:11:42 UTC 2014

bonasso <bonasso at traclabs.com> writes:

> I solved this by coercing 
> (get-internal-real-time)
> into a double float.
> Looks like the epoch start time for these functions is different from
> lisp to lisp.
> ACL: (get-internal-real-time) => 8456209511
> ABCL: (get-internal-real-time) => 1401814359707
> Does anyone know the date from which the value for
> (get-internal-real-time) is computed for abcl?
Why do you need to coerce it to anything for intermediate values?
Store the value returned by (get-internal-real-time), then subtract it
from another (get-internal-real-time), only then divide it by
internal-time-units-per-second, and only then, if you need to, convert
that into floats, for printing or something. That way you will lose
minimal precision.
With best regards, Stas.

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