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jdtofrench
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jdtofrench

Name

jdtofrench — Converts a Julian day count to a French Republican Calendar date.

Synopsis

string jdtofrench(JD); int JD: Julian day count

Returns

French Republican Calendar date; 0/0/0 if an invalid Julian day count is specified

Description

jdtofrench() converts a Julian day count to a French Republican cCalendar date string. The returned date string is formatted as MM/DD/YY.

Valid Julian day counts for this function range from2375840 to 2380952. If a count outside this range is specified, the function returns 0/0/0.

Version

PHP Version: 3+, 4+

Example

Example 75. Convert a Gregorian date to a textual French Republican Calendar date

<?php
function gregorian_to_french ($year, $month, $date) {
    // Define start and end dates for the French Republican Calendar
    $frc_start = gregoriantojd (9, 22, 1792);
    $frc_end   = gregoriantojd (9, 22, 1806);

    // Convert date to a Julian day count
    $date_to_convert = gregoriantojd ($month, $date, $year);

    // Ensure that the date to be converted is within the start and end dates
    if ($date_to_convert < $frc_start || $date_to_convert > $frc_end)
        return FALSE;

    // Define month names
    $month_names = array (
        1 => 'Germinal', 2 => 'Flor&eacute;al', 3 => 'Prairial', 4 => 'Messidor',
        5 => 'Thermidor', 6 => 'Fructidor', 7 => 'Vend&eacute;miaire', 8 => 'Brumaire',
        9 => 'Frimaire', 10 => 'Niv&ocirc;se', 11 => 'Pluvi&ocirc;se', 12 => 'Vent&ocirc;se',
        13 => 'Compl&eacute;mentaire / Festival de Sans-culottides'
    );

    $frc_date = jdtofrench ($date_to_convert);
    list ($month, $date, $year) = explode ('/', $frc_date);
    return "$month_names[$month] $date, $year";
}

echo gregorian_to_french (1799, 9, 22);
?>

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