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Re: [O] dates before 1970
From: |
Carsten Dominik |
Subject: |
Re: [O] dates before 1970 |
Date: |
Mon, 14 Mar 2011 11:21:36 +0100 |
On Mar 11, 2011, at 5:30 PM, Nick Dokos wrote:
> Carsten Dominik <address@hidden> wrote:
>
>
>> THis is exactly the point, that it depends on how Emacs was compiled, and
>> what kind of integer is used in the date representation. Signed or
>> unsigend, 32 or 64 bits (I think).
>>
>> For example, Bastien can represent dates before 1970. I cannot.
>> I can represent dates after 2038, Bastien cannot.
>>
>> The work-around is to use diary sexps for dates before 1970, that seems to
>> be safe.
>> And then hope that by 2038, all computers will use 64 bit integers....
>>
>
> But it's even more than that, no? Emacs's time implementation
> (current-time, encode/decode etc) would have to change. In fact, this
> might be the most significant limitation right now: the values they pass
> around are (hi16 lo16 ms) so they assume that time values are 32 bits,
> no matter what the underlying implementation says. I use 64-bit Linux on
> an x86-64 laptop and my time_t is 64 bits (but I don't know if it's
> signed or unsigned). Time for some experimentation I guess...
I believe that on your system you might get
(hi48 lo16 ms)
You can test if it is signed by trying a date before 1970
(encode-time 0 0 0 1 1 1960)
- Carsten
- Re: [O] dates before 1970, (continued)
Re: [O] dates before 1970, Eric S Fraga, 2011/03/11
- Re: [O] dates before 1970, Carsten Dominik, 2011/03/11
- Re: [O] dates before 1970, Eric S Fraga, 2011/03/11
- Re: [O] dates before 1970, Carsten Dominik, 2011/03/11
- [O] Re: dates before 1970, Gregor Zattler, 2011/03/11
- Re: [O] dates before 1970, Robert Horn, 2011/03/12
Re: [O] dates before 1970, Nick Dokos, 2011/03/11
Re: [O] dates before 1970,
Carsten Dominik <=
Re: [O] dates before 1970, Nick Dokos, 2011/03/14
Re: [O] dates before 1970, Carsten Dominik, 2011/03/14
Re: [O] dates before 1970, Nick Dokos, 2011/03/14
Re: [O] dates before 1970, Achim Gratz, 2011/03/14
Re: [O] dates before 1970, Carsten Dominik, 2011/03/15
Re: [O] dates before 1970, Nick Dokos, 2011/03/11