How to convert between the Julian day count of the PHP calendar and the date period of the French Republican calendar

In the previous article, we learned what the Julian calendar is, what the Julian day is, and we also know "How to convert the date of the Julian calendar to the Julian calendar in PHP Day Count》, this time let’s take a look at how the Julian day count converts to the dates of the French Republican calendar.

In this article, the editor will introduce to you how to convert dates in the French Republican calendar into Julian day counting. I believe that everyone now has a certain understanding of Julian day counting, but let’s learn more about it. , to deepen the impression.

Julian Day (Julian Day) is a timekeeping method that calculates time based on consecutive days within the Julian cycle. It is mainly used by astronomers.

The Julian Day Number (JDN) is calculated starting from noon Greenwich Mean Time and includes a whole day. The starting point (0 day) goes back to the Julian calendar AD 12 noon on January 1, 4713 BC (in the Gregorian calendar it is November 24, 4714 BC ). This date is the common starting point of the three multi-year cycles, and It is the closest starting point in history to modern times. For example, UT12:00 on January 1, 2000 is Julian Day 2,451,545. Next let’s take a look at an example:

If it is September 22, 1805 in the French Republican calendar, what is its Julian day count? What about the other way around?

<?php
$jd=frenchtojd(9,22,13);
echo $jd . "<br>";
echo jdtofrench($jd);
?>

The result is

2380484
9/22/13

In this example, we use frenchtojdh and jdtofrench and two functions.

After reading this example, I believe everyone has a certain understanding and own opinions on frenchtojdh and jdtofrench and the two functions. Without further ado, let’s introduce them in detail

frenchtojd() function converts the French Republican calendar date into Julian day count. The jdtofrench() function converts a Julian day count to a French Republican calendar date.

Syntax

jdtofrench(数字（儒略日计数）);

frenchtojd function

frenchtojd(月份,日期,年份);

: The function only converts dates between 1 and 14 years.

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