What is the MM DD format? What does MM stand for in date? What does DD mean in time? What date format is year month day? What date format does Japan use? Does Canada do day-month-year? What is the time in Canada now? What are the 6 time zones in Canada? Is Canada Time same as us? Where is Canada Central time? Is Toronto in EST? What time are we in Ontario? It would have been perfectly okay to use 2-digit years in the user interface, as long as they were stored in 4 digits.
If done so, any ambiguity would have been detected instantly instead of years later. As a consequence, when it comes to UX, I would answer that it is perfectly acceptable to use 2-digit years in the user interface, as long as. ISO allowed truncation by agreement , where leading components of a date or time are omitted. This provision was removed in ISO I thought the argument about yyyy rather than yy had been dealt with in the run-up to y2k?
There are almost certainly people reading this who will be alive to see turn to , and there are almost certainly coders who have failed to learn the lesson whose code will go horribly pear-shaped come when it will still be in use by somebody, somewhere. Also, people are living to beyond their th birthday in ever-increasing numbers.
Assuming that a user-entered date of birth is always less than a hundred years ago is likely to be a very poor assumption in the near future. I've already read of letters addressed to the parents of year-old pensioners concerning the selection of their first school -- legal threats concerning the non-attendance of these pensioners at primary school are certain to follow soon!
This resolves some ambiguity, not just between different centuries, but also between date formats. For display purposes, you may want to use a long format, e. It is clear and unambiguous, but takes up a large and variable amount of space and may require translation into other languages. For numerical representations, always use YYYY-MM-DD ISO , which is guaranteed to be unambiguous, is an ISO standard, is easy to parse by both computers and humans even those accustomed to other formats , requires no localisation and can be ordered chronologically by lexical sorting.
You should weigh advantages and disadvantages against each other based on your use case - saving these 2 letters is suddenly important if the next best alternative is scrolling on a LED display. But in pretty much all other cases the balance tilts the other way. The Y2K changeover created lots of work, which was good from a monetary view - but it was really boring work. I wont live to see , but please don't make life boring for our heirs Not clear enough? Please don't repeat that error.
Date format by country. In handwritten notes, I sometimes use just YYmmdd for convenience and when I won't be confusing the century.
It depends on what you're trying to achieve. In some cases perhaps more than you think users may need to see a 4-digit year, while in others a two-digit year is adequate. It's not just century-old events that you have to consider, and it depends how you expect your users to input dates.
Here are some examples:. On the other hand it's possible to work in a much more restricted time-frame. If you're selling theatre tickets, and events can only take place within the next year or so, users only need to see a two-digit year. Even past orders would make complete sense with only YY in this case. Honestly, when it comes to dates, I always use the 3 digit representation for the month, just because Americans Either that, or have some obvious way for the user to know what the fields are e.
When it comes to years, using yy is much easier for users, but it depends what you are using it for. If it is for a medical form, it isn't impossible to have someone who was born in the 's who would fill out the form. So in a few years you may find your form very confusing when you have an apparent baby filling out a form requiring a hip replacement. So already there are chances of mixing up the date and month, year is better mentioned full YYYY.
It supports the way we refer the year in our daily lives. The tendency is to say 20 17 or 2k17 or whatever, but its complete YYYY format. In the device: Keep user in control.
Respect local settings of date format. Context of user account: if user can log into a platform e. Initially use ISO format when country is unknown.
Once you have determined the format, handle date display and date entry as described in point 1 above. Global use: if data are targetted to be handed over to other users e. This will leave no one in doubts. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more.
Ask Question. Asked 4 years, 7 months ago. Active 4 years, 7 months ago. Viewed 73k times. Any idea why there is such a preference? Improve this question. Vincent Vincent 1 1 gold badge 5 5 silver badges 5 5 bronze badges.
In the year , somebody is going to curse your name Use neither. I did not expect such a question just 17 years after Y2K. For example, September 27, is represented as No slashes. The "T" separator really helps taking out every ambiguities, and is easy to parse as well. I have log-search scripts that needs to "guess" amongst 12 date formats :' — Olivier Dulac.
No exceptions. Show 12 more comments. Active Oldest Votes. There is no universally good answer to this question , but there are definitely two pros of YYYY: by showing the two leading numbers you can easily tell e. The thinking would be: "Is 09 the year?
Professional usage One situation when you do not need to bother about the notation is a situation when Users deal a lot with the date data, mostly in professional way. Saving space Saving space may be sometimes a really important factor for making decisions. Combining into one text string and sorting In some cases, you may face a situation when you need to combine the date into one big chunk of text. This usage scenario brings two conclusions: it is good to have a full year, because at least the photos from will be after those from , it is good to use the gradual order, progressing from higher to lower unit.
Wrap-up: Do your Users know the system by heart? Now to the norm. There are definitely two ways to go from here. Improve this answer. Community Bot 1. Dominik Oslizlo Dominik Oslizlo Relevant link: xkcd. Why no mention of the ISO standard? Surely the more people aware of the standard and the more people get used to seeing it, the better the standard and the lower the confusion.
Get used to the "T" separator: it really helps taking out every ambiguities, and is easy to parse as well. It is the "universally good answer to this question". Sulthan "date should be formatted according to user language settings". The problem with this is that, more often than not, the user doesn't know if the date has been formatted according to their language settings.
Of course you can solve that with 01 Oct 17 but then you have added a new internationalization problem. I agree with using the ISO format. The unfamiliarity problem is smaller than other problems, and the more it is used, the more this problem goes away.
Day-Month-Year with no separators Year-Month-Day with no separators Month abbreviation-Day-Year with leading zeros Feb Day-Month abbreviation-Year with leading zeros 17Feb Year-Month abbreviation-Day with leading zeros Feb Day-Month name-Year 17 February, Year-Month name-Day , February
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