Osananajimi no Ijou Kawaii Imouto-chan - Vol. 2 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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You can actually fairly easily map the remaining three months onto the existing schema: October is easy, since the dials include 0, which you can use to denote 10. So you can just use the 001 through 031 range to indicate all October birthdays.

That only leaves November and December unaccounted for. But we've still got an out here: from October 1 to December 31 is 92 days, and we've got a range of 99 numbers (since any date of the format X00 is invalid) to work with. We can denote November and December dates using the existing digits on the dials by just counting up endlessly without resetting the first digit from when you flip from 930 (September 30) to 001 (October 1). Doing this will give us the following date mappings:

001 - 031 : October 1 - October 31
032 - 061 : November 1 - November 30
062 - 092 : December 1 - December 31

So for the November dates you subtract 31 to get the day of the month, and for the December dates you subtract 61.

Easy as pie! Best of all, if the target of your obsession finds out all the trouble you went to to encode their birthday into the 3-digit analog password input of your diary they'll be so impressed that they'll be putty in your hands!
Waaaaaaa
 
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Just caught up with this and while I’m usually not a siscon person, this is deranged and funny enough to be super enjoyable. Like others have said, no idea where this is going or who’s end game (I think the bff and younger sis though from the foreshadowing about the younger sis’ heart starting to thaw around the friend) but I’m so here for this. Thank you for the chapter!

Loved the ... falling away to a pile in the bottom of the bubble. Really captures the mood.
As a nerd, I looooove when manga plays with words through artistic ways like that, one of my fav parts of the chapter
 

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