jdtofrench

(PHP 4, PHP 5, PHP 7, PHP 8)

jdtofrench — Converts a Julian Day Count to the French Republican Calendar

Опис

jdtofrench(int $julian_day): string

Converts a Julian Day Count to the French Republican Calendar.

Параметри

julian_day: A julian day number as integer

Значення, що повертаються

The french revolution date as a string in the form "month/day/year"

Прогляньте також

frenchtojd() - Converts a date from the French Republican Calendar to a Julian Day Count
cal_from_jd() - Converts from Julian Day Count to a supported calendar

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User Contributed Notes 4 notes

down

pieterc dot depraetere at ugent dot be ¶

14 years ago

If you want to convert a date later than September 22nd 1806, you could use this function. It's a bit crude and due to the fact the original function terminates in the middle of 1806, it uses 1805 as it's 'terminus post quem'.

<?php

function extended_jdtofrench ($juliandate) {

    if ($juliandate > 2380945) {

        // jdtofrench () only accepts dates until september 1806

        $gregorian_date = jdtogregorian ($juliandate);

        $temp = explode ('/', $gregorian_date);

        $year = $temp[2];

        $juliandate = gregoriantojd ($temp[0], $temp[1], 1805);

        $republican_date = jdtofrench ($juliandate);

        $republican_date = explode ('/', $republican_date);

        $diff = $year - 1805;

        $republican_date[2] = $republican_date[2] + $diff;

    } else {

        $republican_date = jdtofrench ($juliandate);

    }

    return $republican_date;

}

?>

down

squenz at titania dot bottoms-dream dot de ¶

18 years ago

Here is a small piece of code to obtain the string data for a correctly converted gregorian date:



<?php

$arDateFrench = gregorian2FrenchDateArray(11, 9, 1799) ;



echo $arDateFrench[1] . " " . $arDateFrench[0] . " " . $arDateFrench[2] ;



/* the output will be:

    18 Brumaire VIII



*/



function gregorian2FrenchDateArray($m, $d, $y)

{



    $julian_date = gregoriantojd($m, $d, $y);

    $french = jdtofrench($julian_date);

    if($french == "0/0/0")

        return "" ;



    $arD = split("/", $french) ;

    

    // get the month name 

    $monthname = FrenchMonthNames($arD[0]) ;

    

    /* convert the year number to roman digits (as most historians do and documents of the time did */

    $stryear = decrom($arD[2]) ;

    return array($monthname, $arD[1], $stryear ) ;

}



function FrenchMonthNames($mo)

{

    /* The names have been invented by Fabre d'Églantine, a second or rather third rank poet

of primarily pastoral poems, with each name referring to the respective period in the agricultural year; e.g. "Vendémiaire" (approx. September) is derived from "vendange" ("harvest"), "Brumaire" (Ocotober/November) from "brume" ("fog") and so on ...     */

    

    

    $arMo = array("Vendémiaire", 

                      "Brumaire",

                      "Frimaire",

                      "Nivôse", 

                      "Pluviôse",

                      "Ventôse", 

                      "Germinal",

                      "Floréal", 

                      "Prairial",

                      "Messidor", 

                      "Thermidor", 

                      "Fructidor",

                      "Sansculottide") ;



    if($mo < count($arMo)+1) 

        return $arMo[$mo-1] ;

    

}



function decrom($dec){

       $digits=array(

           1 => "I",

           4 => "IV",

           5 => "V",

           9 => "IX",

           10 => "X",

           40 => "XL",

           50 => "L",

           90 => "XC",

           100 => "C",

           400 => "CD",

           500 => "D",

           900 => "CM",

           1000 => "M"

       );

       krsort($digits);

       $retval="";

       foreach($digits as $key => $value){

           while($dec>=$key){

               $dec-=$key;

               $retval.=$value;

           }

       }

       return $retval;

}

?>

down

popy-dev ¶

6 years ago

Also note that there are few date converters handling French calendar outside the jdtofrench covered range.

down

-2

serged at noos dot fr ¶

21 years ago

Very limited function:



(extract from source of 4.3.3)

These routines only convert dates in years 1 through 14 (Gregorian dates 22 September 1792 through 22 September 1806).  This more than  covers the period when the calendar was in use.

 

Pour les fran�ais :

Ces routines ne converitssent les dates que de l'an 1 � 14 (du 22 septembre 1792 au 22 septembre 1806). Cela couvre plus que la p�riode pendant laquelle le calendrier � �t� utilis�.

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