Thanks very much for your reply. Reflecting your post it now is clear to me that the (decimal) order of magnitude of the year (seconds->date (sub1 (expt 2 50))) should be around 7 or 8 (setting second 0 to "Thu, 01 Jan 1970 01:00:00 +0100"). How do you know the year should be (exactly) 35680317? Jos
_____ From: Jon Zeppieri [mailto:zeppi...@gmail.com] Sent: viernes, 19 de febrero de 2016 23:31 To: Jos Koot Cc: Racket Users Subject: Re: [racket-users] second->date I'm not especially familiar with the code in question, but it looks to me like some time-handling code in fun.c assumes 32-bit values. I'm referring to this: [https://github.com/racket/racket/blob/50db01bf2c7c57fd5c7c662307d517ce2c29c 279/racket/src/racket/src/fun.c#L9981]. On a 64-bit system, mzlonglong should be 64 bits wide, I think, but the code here seems to assume 32 bits. Again, I'm really not very familiar with this code, though. (By the way, the date* you get back from (sub1 (expt 2 50)) isn't correct. The year should be 35680317.) -Jon On Fri, Feb 19, 2016 at 4:49 PM, Jos Koot <jos.k...@gmail.com> wrote: The following surprises me: > (seconds->date (sub1 (expt 2 40))) seconds->date: integer is out-of-range integer: 1099511627775 Nevertheless I can go further on in time: > (seconds->date (sub1 (expt 2 50))) #(struct:date* 40 5 11 23 9 22520 1 266 #t 7200 0 "Romance Daylight Time") But when I go too far in future, I find myself in the past: > (seconds->date (sub1 (expt 2 62))) #(struct:date* 59 59 0 1 1 1970 ---> the future seems to be in the past 4 0 #f 3600 0 "Romance Standard Time") This in the REPL of DrRacket (64 bits, Windows 7) Anyone an idea what is happening here? Things go well with seconds < (expt 2 31) Thanks, Jos -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
