Osananajimi no Ijou Kawaii Imouto-chan - Ch. 9 - Lil' Sis Resists

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ISO is the International Organization of Standards (abbreviating it to ISO instead of IOS appears to be for aesthetic reasons). It's an international organization which sets standards for a range of things.

ISO 8601 deals with how to write dates, a date format. Typically, in many parts of the world, you write the day then the month then the year and, principally in the US, in some places you write the month then the day then the year.

ISO 8601, however, specifies that you should write the year then the month then the day, ordering from most general to most specific. This is the way any date will be written by any ISO compliant organization so, despite this not being too common in lay usage, it appears in many contexts around the world.

No year is given on either of these locks, but months and dates are formatted to comply with ISO 8601 with the year part removed, hence the locks being compliant with a truncated ISO 8601.
Huh ... do they establish standards for everything in the world?
 
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Huh ... do they establish standards for everything in the world?
There's probably stuff they don't have a standard for, but pretty much. You can find, for example, ISO 5826 which gives the standard for what transformers to use for resistance welding or ISO 10865 which gives the standard for securing people in wheelchairs when they use vehicles for personal transportation or ISO 216 which gives the standard for the size of office paper or ISO 34000 which defines terms related to date and time. You can read more standards here.
 
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There's probably stuff they don't have a standard for, but pretty much. You can find, for example, ISO 5826 which gives the standard for what transformers to use for resistance welding or ISO 10865 which gives the standard for securing people in wheelchairs when they use vehicles for personal transportation or ISO 216 which gives the standard for the size of office paper or ISO 34000 which defines terms related to date and time. You can read more standards here.
Have to say that that's pretty nuts, but the more you know, I guess.
 
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I'm not buying that the diary just had nothing important. Why else would she put two locks in it? Plus her face when looking at it obviously was trying to set up some foreshadowing to be seen in the following chapters
 
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Momo's diary's combination is 509, and Mizuki's diary's combo is, as we learned in chapter 1, 303. These are apparently each other's birthdays. Since we're dealing with a 3 digit combination lock with no punctuation the date format when we only knew Mizuki's combo was ambiguous and could represent either March 3 or March 30, depending on whether or not you read it as following a MDD or DDM format. However, there's no valid way to fit 509 into the DDM schema, which means that they must be using the MDD format, making Momo's birthday May 9.

We can therefore all rest easy knowing that these yuri sisters are -- to the extent permissible by the medium -- standards compliant with a truncated ISO 8601 date format.
It wasn't really in question. Japanese dates are already written in that format (except each segment is followed by the relevant kanji for year, month, day). A dd/mm scheme would look as weird in Japan as it does in the US.
 

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