Comment Even better idea (Score 1) 725
"With computer programs and mathematical formulas" I found an idea of thirteen months, each four weeks = 28 days. Thus every MONTH would be like the previous, would begin with monday etc. One thing more: we add one day to celebrate year change (or what ever) and that day is part of no week or month. 13*28+1 = 365. Since we cannot change world rotation, we must yet add one day on leap years.