From: jrs@merlyn.demon.co.uk   
      
   JRS:  In article <5oOdnfl-GsVSx6XeRVn-gA@comcast.com>, dated Mon, 26 Sep   
   2005 16:33:00, seen in news:comp.lang.pascal.borland, William J. Leary   
   Jr.  posted :   
   >"Dr John Stockton"  wrote in message   
   >news:2Zih6OCalAODFwg1@merlyn.demon.co.uk...   
      
   >> Within the nominal validity range of DOS, 1980-2099, there is a Leap   
   >> Year every 4 years.  It's easy enough to convert from years starting in   
   >> January to ones starting in March, and then the Leap Year correction is   
   >> just Year div 4.   
   >   
   >Yes.  I understand that as a simple solution.  I also worked out the 100 and   
   >400 rules, on paper, and had run across some notes about a millenia rule as   
   >well,   
   > ...   
      
   There is no millennia rule, indeed no rule higher than 400, and there   
   never has been, except perhaps temporarily a 4000 year rule for certain   
   European revolutionaries.  A 4000 year omission rule would be about   
   right; a 3200 year one would be quite good, but a 1000 year-rule would   
   over-correct and make matters worse, as the target is around 365.2422   
   days per year.   
      
   See , the Papal Bull   
   /Inter Gravissimas/, and the Calendar Act 1751 which applies to the   
   American colonies (but expressly omits AU & NZ!).   
      
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