The problem is: unless for statistical analysis of strange phenomena (probably only Physics and geological), the representation of time is inherently HUMAN-centered and this is what gives rise to the very OP's stated CONS.<p>Unless there is a 'year, month, day', the use of this is probably more theoretical than real.<p>Don't get me wrong: it is OK as a tool for time-series analysis. But then again, it will lose the Seasons very shortly. And then... A Gregorian update will be needed.
With ISO 8601 [1] there is already a standardized way of representing dates, times and intervals.<p>This suggestion has at least one major design flaw - you can not represent many common recurrences using seconds. Not every day has 86,400 seconds, not every month has 30 days, not every year has 365 days.<p>[1] <a href="http://en.wikipedia.org/wiki/ISO_8601" rel="nofollow">http://en.wikipedia.org/wiki/ISO_8601</a>