see:

The e-mail sent out by paperbackswap is wrong:

http://en.wikipedia.org/wiki/Julian_calendar#Month_lengths

"

He then said Augustus changed this to:

31, 28/29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31

so that the length of Augustus would not be shorter than (and therefore inferior to) the length of Iulius, giving us the irregular month lengths which are still in use.

There is abundant evidence disproving this theory. First, a wall painting of a Roman calendar predating the Julian reform has survived,^[4] which confirms the literary accounts that the months were already irregular before Julius Caesar reformed them:

29, 28, 31, 29, 31, 29, 31, 29, 29, 31, 29, 29"