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Dates before 1902?

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Dates before 1902?

Postby mvluijt » Tue Nov 29, 2011 3:45 am

Hi Guys,

I'm running into all kinds of trouble with back issues dating back to before 1902. OJS won't import those. A small hack did help, I got them imported but things like DOAJ export do not work properly. I am aware of the 32-bit UNIX date limit, which seems to affect me here, but I was hoping the OJS's use of ADODB would remove that limit.

So, the basic question is, does OJS support dates before 1902?

We're running a 32 bit PHP here, which may be the problem, and I may get an upgrade to 64 but I'll need some positive reinforcement...
OJS version of this install is 2.2.3

Thanks!

Best, Martin
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Re: Dates before 1902?

Postby JasonNugent » Tue Nov 29, 2011 4:06 pm

Yes, the 32 bit limit is a problem. Unix uses a signed 32-bit integer to store the unix timestamp, which limits you to:

MAX: 2147483647 = 2038-01-19 03:14:07 +0000
MIN:-2147483648 = 1901-12-13 20:45:52 +0000

An upgrade to a 64-bit OS will probably remove this limitation.

Regards,

ason
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Re: Dates before 1902?

Postby MMeijer » Thu Aug 23, 2012 8:44 am

Hi,
It turns out that OJS itself - nor ADODB - do have a problem with 32-bit Unix in relation to dates before 1902.
In fact, if a ADODB dateconversion function signals a problem, it just returns the date from the database as-is.
But: Smarty's date conversion (e.g. in /templates/editor/issues/backIssues.tpl) is NOT that smart, nor is the DOAJ plugin (see DOAJExportDom::formatDate()).
So, by some small adjustments in the templates and DOAJ plugin, and may be some other spots, one can live with 32bits ...

Cheers!
Maarten
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