explain xkcd - User contributions [en]

Talk:2236: Is it Christmas?

2019-12-03T17:24:33Z

Konklone: more explanation

according Wayback Machine, the site [https://web.archive.org/web/20181225014549/https://isitchristmas.com/ still] [https://web.archive.org/web/20171225032723/https://isitchristmas.com/ says] [https://web.archive.org/web/20161209052757/https://isitchristmas.com/ NO] [https://web.archive.org/web/20151225060146/https://isitchristmas.com/ even] on Christmas. --[[User:Valepert|valepert]] ([[User talk:Valepert|talk]]) 21:56, 2 December 2019 (UTC)

:Hmmm, maybe it will be fixed this year. I imagine everybody spammed the guy on twitter when it didnt work last year. [[Special:Contributions/172.68.132.155|172.68.132.155]] 22:06, 2 December 2019 (UTC)

:; It checks your system time
:It uses the <code>new Date()</code> constructor to check whether it is Christmas, which uses your system time. Thus, the Wayback won't get anything, but changing your system time will. Kay? [[User:Jacky720|That's right, Jacky720 just signed this]] ([[User talk:Jacky720|talk]] | [[Special:Contributions/Jacky720|contribs]]) 22:14, 2 December 2019 (UTC)

Okay so looking at isitchristmas.com, there's a comment at the top of the page saying to look at the console, but I don't see anything in there, anyone know what that might be about? Also at the bottom of the html file, the bottommost <script> tag looks like it might contain code for a chat client? I don't know JS so I'm unsure, but I tried changing all the related "false" values to "true" that looked relevant and nothing happened, so idk. Maybe someone else can figure it out. [[Special:Contributions/172.68.132.155|172.68.132.155]] 22:03, 2 December 2019 (UTC)
:(I'm the dev.) Check back again closer to Christmas, on 12/23 or 12/24. [[User:Konklone|Konklone]] ([[User talk:Konklone|talk]]) 00:55, 3 December 2019 (UTC)
::I mean, I kind of find that suspect. [[Special:Contributions/172.68.47.234|172.68.47.234]] 01:39, 3 December 2019 (UTC)
:::seconded. that's a suspicious lot of javascript just to display yes or no, even with globalisation. --[[Special:Contributions/141.101.107.144|141.101.107.144]] 10:07, 3 December 2019 (UTC)
::::There are some other features besides globalization, but they only take effect closer to Christmas. [[User:Konklone|Konklone]] ([[User talk:Konklone|talk]]) 17:24, 3 December 2019 (UTC)

Well, one way to put it is that the overall probability of a false negative is 0.27%, which doesn't seem too bad, but the conditional probability of a false negative given that it's Christmas is 100%, which is horrid. --[[User:IByte|IByte]] ([[User talk:IByte|talk]]) 22:37, 2 December 2019 (UTC)

Of course it depends on your definition of "It's Christmas". The figure is right if you just mean Christmas Day and ignore the Julian vs Gregorian issue, but not you subscribe to "the 12 days of Christmas" = Christmas ... Just saying ;-) [[User:RIIW - Ponder it|RIIW - Ponder it]] ([[User talk:RIIW - Ponder it|talk]]) 23:53, 2 December 2019 (UTC)
:Every year, people ask me about including multiple definitions of Christmas, but I think for my own sanity it's going to keep looking just at 12/25. ;) [[User:Konklone|Konklone]] ([[User talk:Konklone|talk]]) 00:57, 3 December 2019 (UTC)
::There's an assumption here that people will only want to celebrate Christmas once a year. Might be different for someone living in a community with multiple religions who likes the holiday, or wants an excuse to take an additional day off work! --[[User:Marcus Rowland|Marcus Rowland]] ([[User talk:Marcus Rowland|talk]]) 11:08, 3 December 2019 (UTC)
:::But that would not be Christmas. Christmas is the day the Bible states Jesus was born (or at least if it is in the bible at all, the day Christians choose to claim Jesus was born). Thus only one day can be Christmas and no matter how you choose to celebrate and when or how many days, still only the 25th of December will be Christmas! --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 12:41, 3 December 2019 (UTC)
::::I'm Catholic, Christmas day is one day a year, but Christmas (the liturgical season) ends on The Baptism of the Lord, which varies but can be as late as January 13th. [[Special:Contributions/172.69.63.91|172.69.63.91]] 15:19, 3 December 2019 (UTC)
::::There are at least two Christmas days, as noted previously - the Western one on 25th December, and the Eastern Orthodox version which is based on an older calendar and is now in January according to the Western calendar, because their calendar has slipped compared to ours. But if someone wants to celebrate both there is really no reason why not - they don't have to be followers of the religion to want to take a holiday. Or if you want another reason, in communities with followers of both versions of Christianity, there will be days when the followers of one or another version are celebrating Christmas and businesses etc. are closed, which will affect everyone regardless of which religion they follow, if any. --[[User:Marcus Rowland|Marcus Rowland]] ([[User talk:Marcus Rowland|talk]]) 15:33, 3 December 2019 (UTC)
How do we know Randall's version is wrong on Christmas? Has anyone set their system clock to Dec 25 and checked it? [[User:Barmar|Barmar]] ([[User talk:Barmar|talk]]) 02:14, 3 December 2019 (UTC)
:Have tested; Randall's displayed "no" as per main image. isitchritmas displayed "yes" as per explanation. [[User:RedHillian|RedHillian]] ([[User talk:RedHillian|talk]]) 02:44, 3 December 2019 (UTC)
::It may be Randall uses Server-Time, and not client-time like isitchristmas.com - Also, in the official Calendars, there are two Christmas days, first and second day of Christmas. I think Randall went only for the gifting day, which is different in many countries anyway. My kids get there presents on Christmas eve (24 December), their friends mostly on 6 December (Sint Nicolas) (or the evening before). [[Special:Contributions/141.101.77.62|141.101.77.62]] 07:45, 3 December 2019 (UTC)
:: Based on his 99.73% accuracy comment, I assume the comic is a static image, and will always show "NO", even on Christmas day. I think that is the whole joke, that his comic is correct 364 (+ leap days) of the year, when it is not Christmas. [[Special:Contributions/172.69.34.158|172.69.34.158]] 08:23, 3 December 2019 (UTC)
:::Of course this is a static image, that is the whole point. ;-) In Demark we also have the [https://erdetfredag.dk/ is it Friday] which at least is easier to check if it works, as it changes from No (Nej) to Yes (Ja) once a week. As mentioned above in Denmark the isitchristmas answers in Danish with a Nej. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:34, 3 December 2019 (UTC)

About "when is christmas". Christmas consists of two days, which makes the calculation of predicted correctness too optimistic. (99,45% for 363/365 and for 364/366; 99,38% for 363/365.25)[[Special:Contributions/141.101.77.62|141.101.77.62]] 07:45, 3 December 2019 (UTC)
:No only the 25th of December is called Christmas Day. All other days are thus not Christmas, but just days you choose to celebrate that the 25th is Christmas! --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 12:41, 3 December 2019 (UTC)

"In the western world celebrated on 25th" is not correct. For UK,US and Canada and probably a lot others it might be true, german and I think spanish speaking countries not.
:No no. Even when you celebrate Christmas Eve on December 24th (as also in Denmark) we call the 25th Christmas Day. Even if you also celebrate the 2nd Christmas day, there is only one day a year that it is Christmas, and that is the 25th of December. That is when Christians claim Jesus was born. Of course I celebrate the Winter solstice (and accept that I do this a few days off, since that is when I can have the day off.) In Denmark we count the days up till the 24th and celebrate in the evening, (as the Vikings always did, because the new day began the sun set.) We do not look at the 12 days after. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:34, 3 December 2019 (UTC)
::The word "celebrated" or "to celebrate", means (according to [https://www.lexico.com/en/definition/celebrate Lexico/Oxford]): "Acknowledge (a significant or happy day or event) with a social gathering or enjoyable activity." This activity is not set as a single day for the western world. E.g. in Germany it is acknowledget with social gatherings and enjoyable activities for at least 3 days: Christmas eve (24th), First Christmas day (25th) and second christmas day (26th December). Additionally not all the western world (is that even properly defined?) does acknowledge the birth of christ (significant/happy event) by social gatherings or enjoyable activities (e.g. you, as you stated yourself.)--[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 09:59, 3 December 2019 (UTC)
:::The word celebrate is not present in the comic. That is about the question if today is Christmas. When you choose to celebrate Christmas has nothing to do with what day is Christmas, and also other religious holidays has nothing to do with Christmas at all. Do not mix up different issues here. This comic is only wrong on 25th of December which is Christmas day. All other days you choose to celebrate Christmas is not Christmas Day! And thus it is not Christmas! --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 12:41, 3 December 2019 (UTC)
::::So you also agree, that the statement in the explanation is wrong? I will change it.--[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 12:47, 3 December 2019 (UTC)
:The XKCD page has the additional advantage of being equally accurate whether you follow [https://en.wikipedia.org/wiki/Gregorian_calendar Western] or [https://en.wikipedia.org/wiki/Eastern_Orthodox_liturgical_calendar Eastern Orthodox] calendars, or whatever calendar you choose! --[[User:Quantum7|Quantum7]] ([[User talk:Quantum7|talk]]) 08:39, 3 December 2019 (UTC)

Reminds me of [[937: TornadoGuard]] in subject matter.--[[User:Henke37|Henke37]] ([[User talk:Henke37|talk]]) 09:47, 3 December 2019 (UTC)
:I was mostly reminded of [[1132: Frequentists vs. Bayesians]]. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 10:06, 3 December 2019 (UTC)

Is the comic closely enough related to be put into [[:Category:Statistics]]?--[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 13:21, 3 December 2019 (UTC)

Some other sites with the same idea: http://ismycomputeron.com https://shouldiblamecaching.com http://iscaliforniaonfire.com http://www.ismycomputeronfire.com/ [[User:Ahiijny|Ahiijny]] ([[User talk:Ahiijny|talk]]) 14:47, 3 December 2019 (UTC)

Also this flowchart: [[1723: Meteorite Identification]] - I am currently to absent-minded to get a proper wording for the relation right. --[[User:Lupo|Lupo]] ([[User talk:Lupo|talk]]) 14:57, 3 December 2019 (UTC)

Talk:2236: Is it Christmas?

2019-12-03T00:57:03Z

Konklone: replying about future site behavior

Talk:2236: Is it Christmas?

2019-12-03T00:55:48Z

Konklone: replied to someone about site behavior