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Is RCS / CVS Y2K compliant?

Posted on 1998-06-23
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My underlying OS (SVR4) is Y2K compliant but I was wondering whether RCS and CVS was capable of storing and manipulating dates beyond 1999?

Has anyone actually tested this?
Iis there anything like a site that could provide an "official" answer to this question (eg. support@gnu.com)?:
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Question by:firefox032697
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by:ahoffmann
ID: 2008153
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by:richrussell
ID: 2008154
In general most unix applications that have been rewritten several times (RCS certainly has), will use the unix time C library. This is a 32 bit counter from 1/1/1970 in seconds. So it will wrap round in 2038.

However, anything compiled using very recent libraries (ie last year or so), will probably be using a 64 bit counter. This will expire in about 500,000,000,000 - the Earth is set to be swalled up by the Sun in about 20,000,000. So no need to worry there!

I know this doesn't answer the question, but it's interesting all the same...
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by:ahoffmann
ID: 2008155
RCS and SCCS store dates in the form  yy/mm/dd, so they are not Y2k complient.
AFAIK, SCCS uses 1969 as base (not 1970) and therefore is y2k complient 'till 2068.
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by:jos010697
ID: 2008156
I just checked GNU's implementation of RCS and they explicitely mention
that:

'Y' contains just the last two digits of the year for years from 1900 through
1999, and all the digits of years thereafter.  Dates use the Gregorian calendar;
times use UTC.

This makes me feel quite confident the (at least GNU's) RCS is Y2K 'safe' ...

kind regards,

Jos aka jos@and.nl

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by:ahoffmann
ID: 2008157
jos, it couldn't be Y2K safe if it just uses 2 digits per year.
Example:
  have a file with deltas made
    01-jan-1999, 31-dec-1999,
    01-jan-2000, 01-jan-2099, 02-jan-2099, 31-dec-2099
then use:
    co -d"1999-01-01" file
    co -d"2099-01-01" file
to get it back.
I never tested this, but I expect that you get deltas from 01-jan-1999 and newer for both co commands.
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JYoungman earned 50 total points
ID: 2008158
RCS 5.x is y2k compliant.   For backward compatibility with (very) old versions it uses 2-digit dates until the end of 1999.   After that it uses 4 digits.    

CVS 1.9 itself is not y2k compliant, but there are updates to it (numbered 1.9.x) which are definitely y2k compliant.

It is *possible* for SCCS to be y2k compiant, as ahoffmann stated, but most installed versions of unix have a non-compliant version.    All the Unix vendors offer a compliant version currently though -- you would need to pay for it.  
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