#gregorian-calendar — Public Fediverse posts

If you have trouble remembering those rhymes about how many days a month has, I have the perfect and very memorable poem for you!

function daysInMonth(month: number, year: number): number {
    return month === 2 ? (year % 4 === 0 && year % 100 !== 0 || year % 400 === 0 ? 29 : 28) : [4, 6, 9, 11].includes(month) ? 30 : 31;
}

Feel free to share it with friends and colleagues to help them remember!

#codinghumor #memory #gregoriancalendar

Scheduling issues

https://piefed.social/c/historymemes/p/1822386/scheduling-issues

The #GregorianCalendar was introduced in a papal bull #OnThisDay in 1582.

Despite numerous attempts by radicals to reform the calendar, commerce usually decides how we measure time.

🔓 This archive article is free for 7 days

https://www.historytoday.com/archive/history-matters/how-change-calendar

Georgian calendar
From Wikipedia, the free encyclopedia
Not to be confused with Gregorian calendar.

https://en.wikipedia.org/wiki/Georgian_calendar

#Wikipedia #GeorgianCalendar #GregorianCalendar

In #Thailand, two main calendar systems are used alongside each other: the #ThaiSolarCalendar, based on the #GregorianCalendar and used for official and most day-to-day purposes, and the #ThaiLunarCalendar (a version of the #BuddhistCalendar, technically a #lunisolarCalendar), used for traditional events and Buddhist religious practices.

This 👇🏽 is good 👌🏽:

“A Leap Year Check In Three Instructions”, Falk Hüffner (https://hueffner.de/falk/blog/a-leap-year-check-in-three-instructions.html).

Via HN: https://news.ycombinator.com/item?id=43999748

On Lobsters: https://lobste.rs/s/ybjgex/leap_year_check_three_instructions

#Optimization #Assembly #Compilers #GCC #Math #LeapYear #GregorianCalendar #BitTwiddling #Speed

It’s #CalendarAdjustmentDay, marking the day in 1752 when Britain and its colonies jumped forward 11 days overnight, to sync up with the Gregorian calendar. And you can celebrate by learning about the history and etymology of that calendar, in our video! https://www.youtube.com/watch?v=iSEfWDwvxWE

#Etymology #Video #WordNerd #Linguistics #Language #Words #HistoricalLinguistics #LingComm #Calendar #GregorianCalendar

Is there some #genealogy software that does dates correctly?

E.g. user enters dates as recorded by authorities, but lets assume that a person moved from #Norway / #Denmark to Sweden in 1730. The records in #Norway / #Denmark would be in #GregorianCalendar, and the Swedish dates would be in #JulianCalendar. Assume that there are dates from the first decade of 1700s, when the #SwedishTransitionalCalendar was in operation and subsequently paused and abandoned, resulting in that February 30, 1712 is a valid date in #Sweden(!), and the other days being one day off from the Julian calendar.

Basically, all software seems to flag the date of 1712-02-30 as invalid, because it is impossible to specify the correct calendar.

And lets not get started about age calculations before new-year was moved to first of January (in many places this was well before the #Gregorian calendar introduction).

#Religion overpowers #logic, again 😞:

“The World Very Nearly Adopted A Calendar With 13 Months Of 28 Days”, The Washington Post (https://www.washingtonpost.com/history/2023/11/04/battle-sabbath-13-month-calendar/).

Via HN: https://news.ycombinator.com/item?id=38147981

#TheLeagueOfNations #Judaism #InternationalFixedCalendar #GregorianCalendar #Calendar

It’s #CalendarAdjustmentDay, marking the day in 1752 when Britain and its colonies jumped forward 11 days overnight, to sync up with the Gregorian calendar. And you can celebrate by learning about the history and etymology of that calendar, in our video! https://www.youtube.com/watch?v=iSEfWDwvxWE

#Etymology #Video #WordNerd #Linguistics #Language #Words #HistoricalLinguistics #LingComm #Calendar #GregorianCalendar

Marking its ‘Christening’ as #Kyiv during the rule of Volodymyr the Great in 988, #Ukraine will celebrate its #StatehoodDay on July 28th for the last time this year. 👉 https://en.m.wikipedia.org/wiki/Statehood_Day_(Ukraine)

It will be celebrated on July 15th afterward, as the country has now switched to the #GregorianCalendar.

@davep
🥥 Slow -- and VERY well-deserved -- applause for your #GregorianCalendar, David! 🥥

@offenesMA @robertcasties ich habe da eine XSLT Implementation für die Umrechnung on gregorianischen, altem und neuem julianischen, hijri, osmanischem Finanzkalender und koptischem Kalender für TEI Editionen geschrieben. Die Konverter sind allerdings unabhängig von TEI: https://github.com/tillgrallert/xslt-calendar-conversion

#Calendar #XML #TEI #JulianCalendar #GregorianCalendar #Hijri #CopticCalendar #OttomanFiscalCalendar

TFW when you’re born on October 6, 1582 😲

#calendar #gregoriancalendar

I need a better calendar!

Instead of:

yo, jesus was born 2023 years ago you shall be always reminded about that when you think about a fucking time!

And like something that is not using the solar system as a reference so that it can be used across different star systems or ideally galaxies while carrying a meaningful information

helpppp

#galaxy #calendar #star #starsystem #gregorian #gregorianCalendar

#Shevat (also #Shvat) /ʃəˈvat (Hebrew & English)/ = 5th month of the Jewish #CivilYear, and 11th month of the #liturgicalYear. The word is borrowed from an Akkadian word meaning "strike," probably in reference to seasonal heavy rain in that region at that time of year (January-February in the #GregorianCalendar)

Tu B' Shvat = "15 in Shvat" [15th of Shvat], the New Year of the Trees. Also called Rosh Hashanah La'ilanot (= "head-of the-year for-trees", i.e. New Year For Trees) ...

8/

Yom Saint #Valentine Ha'Kadosh = day [of] Saint Valentine the-holy [(St.) Valentine's Day]

#Av /av/ = the 11th #month of the #civilYear and 5th month of the #liturgicalYear in the #HebrewCalendar. Corresponds to July/August in the #GregorianCalendar. Borrowed from the Akkadian word “abum” meaning “fire month.”

#tu = 15 (more in next toot)

b' (also be) /bə/ (Hebrew) = prepositional noun prefix roughly equivalent to "in", "at", and "with"

B'Av (bə'ʔav) = in [month of] Av [i.e. "of Av"]

2/

I've spent the last several months trying to decipher an 1860 English translation of the #SuryaSiddhanta, which was originally written in #Sanskrit and published in its final form in KY 3606 (505 AD). After tracing multiple errors and bugs, I've finally gotten a pretty accurate algorithm which agrees with the methods of late Classical Indian #astronomy as well as observations...

And it looks like modern Indian Solar New Year is actually synched to the #GregorianCalendar.

#Programming

#MizrachiChristians = Eastern Orthodox Christians, who follow the #JulianCalendar (a calendar developed under Julius Caesar); the #GregorianCalendar modified it very slightly to correct for solar drift (the Julian has 1 too many leap days every 400 years or so), but as an innovation of the Roman Catholic Church the Orthodox denominations did not adopt it.

6/

In the 17th century, #IsaacNewton recognised that the #julianCalendar was deficient but the #GregorianCalendar was too #Catholic for him. He worked on a new calendar whose mean year was just a few seconds shorter than the #TropicalYear (the mean Gregorian year is about 29 seconds longer). Newton viewed this as a feature rather than a bug, because under his system, the dates of the solstices and equinoxes would gradually drift back to those when #Jesus was alive.

#Sweden decided to adopt the #GregorianCalendar in 1700, but tried to skip issues with skipping days by omitting 11 #LeapYears between 1700 and 1740 until Swedish dates matched those of #Catholic countries. This completely failed, and Sweden just skipped a bnch of days in 1753. In the intervening chaos, February had 30 days in Sweden in 1704 and 1708.