You can count on me to be bothered by things that reasonable people don't worry about. For instance, take the new millennium. Supposedly, we have just entered the third millennium of the Common Era this year. We didn't enter it last year because the eggheads who pontificate about such things decided that there was no year zero.
Let's examine this a little more closely. The number designating every year of the third millennium will start with a two, except for the very last year, which will be year 3000. Does this strike anyone besides myself as strange? Why the inconsistency? Wouldn't it make more sense to define the third millennium's years as those beginning with a two?
From another angle: I believe that everyone would agree that we are in the first decade of the new century. Note, however, that the decade's digit in the date is a zero! It then seems reasonable to me that, as in many programming languages, the first occurrence of an element of a series should be numbered zero, or in general, the nth item of a series should be numbered n-1. The cardinal number of items in a series would agree with the ordinal of the last element. That is, the last of a group of three items would be numbered two, and would be the third item.
It is not difficult to imagine this principle being applied universally. Military time already works this way: midnight is zero hour. Calendars would look a little strange - January (the first month, month zero) would start with day 0, which would be the first day. The last day of February on non-leap years would be February 27, which would be the 28th day of that month.
What the heck - since I'm messing with the calendar already, I might as well fix it. My favorite version of calendar reform would add a thirteenth month, and would change all of the other months to 28 days, or four weeks. This accounts for 364 days. There would then be an intercalary day inserted between December 27 and January 0 each year. This day would not have a day of the week. Thus, every month would start on, say, a Monday, and every day would always fall on the same day of the week.
Of course, we would have to insert another day every four years except for every hundred years except for every four hundred years to account for leap years (which are needed because the Earth's orbit takes amazingly close to 365.2425 days). This day, too, would not fall on a day of the week. Sounds like a good reason for a holiday!
Such changes would put calendar manufacturers out of business, so I expect we will never see them implemented, at least on this planet. If we ever manage to get to other planets, I hope that wiser heads will prevail when setting up a time reckoning system. I don't imagine it will be their first priority, though - just another thing you can count on me to needlessly worry about.
You can respond to my ranting here.
Time heals all rants.