You'd still need leap-days, then, though. Otherwise, in 150 years, june, or whatever is the 6th month, has drifted from summer to winter (or viceversa) by then.

You'd still need leap-days, then, though. Otherwise, in 150 years, june, or whatever is the 6th month, has drifted from summer to winter (or viceversa) by then. Another issue, is that while 28 is neatly divisible, 13 is not. What is half a year? When do you make up the numbers for Q3? etc. It introduces so much issues, that the net-benefit is hardly there.