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this post was submitted on 02 Sep 2024
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The year is the information that most of the time is the least significant in a date, in day to day use.
DDMMYY is perfect for daily usage.
Your day to day use isn't everyone else's. We use times for a lot more than "I wonder what day it is today." When it comes to recording events, or planning future events, pretty much everyone needs to include the year. Getting things wrong by a single digit is presented exactly in order of significance in YYYY-MM-DD.
And no matter what, the first digit of a two-digit day or two-digit month is still more significant in a mathematical sense, even if you think that you're more likely to need the day or the month. The 15th of May is only one digit off of the 5th of May, but that first digit in a DD/MM format is more significant in a mathematical sense and less likely to change on a day to day basis.
For any scheduled date it is irrelevant if you miss it for a day, a month or a year. So from that perspective every part of it is exactly the same, if the date is wrong then it is wrong. You say that it is sorted in the order of most significants, so for a date it is more significant if it happend 1024, 2024 or 9024? That may be relevant for historical or scientific purposes but not much people need that kind of precision. Most people use calendars for stuff days or month ahead or below, not years or decades.
If I get my tax bill, I don't care for the year in the date because I know that the government wants the money this year not next or on ten. If I have a job interview, I don't care for the year, the day and months is what is relevant. It has a reason why the year is often removed completely when dates are noted or made. Because it Is obvious.
Yes I can see why YYYY-MM-DD is nice for stuff like archiving purposes, it makes sorting and grouping very easy but there they already use the best system for the job.
For digital documents I would say that date and time information should be stored in a defined computer readable standard so that the document viewer can render or use it in any way needed. That could be swatch internet time as far as I care because hopefully I would never look at the raw data at all.
Most significant to least significant digit has a strict mathematical definition, that you don't seem to be following, and applies to all numbers, not just numerical representations of dates.
And most importantly, the YYYY-MM-DD format is extensible into hh:mm:as too, within the same schema, out to the level of precision appropriate for the context. I can identify a specific year when the month doesn't matter, a specific month when the day doesn't matter, a specific day when the hour doesn't matter, and on down to minutes, seconds, and decimal portions of seconds to whatever precision I'd like.
Ok, then I am sure we will all be using that very soon, because abstract mathematic definitions always map perfectly onto real world usage and needs.
It is not that I don't follow the mathematic definition of significance, it is just invalid for the view and scope of the argument that I make.
YYYY-MM-DD is great for official documents but not for common use. People will always trade precision for ease of use, and that will never change. And in most cases the year is not relevant at all so people will omit it. Other big issue: People tend to write like they talk and (as far as I know) nobody says the year first. That's exactly why we have DD-MM and MM-DD
YYYY-MM-DD will only work in enforced environments like official documents or workspaces, because everywhere else people will use shortcuts. And even the best mathematic definition of the world will not change that.