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I use the date when the date means something (Score:2)
I started using a date as the major version with Business::ISBN::Data [cpan.org] because the data are linked directly to particular releases from the ISBN Agency.
Beyond that I might use the date for something that is not a major version, but I just finished a project that had a pain point with version.pm because it used too many digits in the version, including major and minor versions, the svn revision, and build number. The svn version got to six digits (and maybe seven within a year in the shared repo), and the bui
major numbers are escape hatches (Score:1)
I'm not a big fan of version numbers meaning anything but "newer," but I'd always suggest 1.YYYYMMDD over YYYYMMDD because later if you decide that 20100720 is a terrrible version number, you're kind of stuck with it. If you used 1.YYYYMMDD, you just bump to 2.000.
rjbs