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Q:

PHP jdtofrench() function (with example)

I have been working with PHP recently and I came across a requirement where I need to convert a Julian day number to its corresponding French Republican Calendar date. After doing some research, I couldn't find a built-in PHP function specifically for this purpose.

Can anyone guide me on how to create a custom PHP function that can convert a Julian day number to French Republican Calendar date? I would really appreciate it if you can provide an example code that demonstrates the usage of the function.

Thank you in advance for your help!

All Replies

boehm.viva

Sure! I've also had a similar requirement in one of my PHP projects, and I found a different approach to convert Julian day numbers to French Republican Calendar dates.

Instead of relying on PHP's built-in date() and mktime() functions, I used a library called "JDDayOfWeek" which provides a more advanced solution. This library has a jdtofrench() function specifically designed for this conversion.

Here's an example of how you can use the JDDayOfWeek library:

php
require_once 'path/to/JDDayOfWeek.php';

function jdtofrench($jd) {
$frenchDate = JDDayOfWeek::jdtofrench($jd);

return $frenchDate;
}

// Example usage
$jd = 2459266; // replace with your Julian day number
$frenchDate = jdtofrench($jd);
echo "The French Republican Calendar date for JD $jd is $frenchDate.";


In this approach, I included the JDDayOfWeek library (you can replace `'path/to/JDDayOfWeek.php'` with the actual path to the library file) and used its jdtofrench() function directly. This function takes the Julian day number as a parameter and returns the corresponding French Republican Calendar date.

Using a specialized library like JDDayOfWeek can be particularly helpful if you have more complex requirements related to Julian day numbers or if you prefer to rely on established, tested code.

Give it a try and let me know if you need any further assistance!

natalia.pollich

Sure, I'd be happy to share my experience with creating a PHP function to convert Julian day numbers to French Republican Calendar dates.

I had a similar requirement in one of my projects, and what I did was create a custom function using PHP's date() and mktime() functions. Here's an example of how you can achieve this:

php
function jdtofrench($jd) {
// Convert the Julian day number to Unix timestamp
$timestamp = (($jd - 2440587.5) * 86400.0);

// Convert the Unix timestamp to French Republican Calendar date using date() function
$frenchDate = date('d-m-Y', $timestamp);

return $frenchDate;
}

// Example usage
$jd = 2459266; // replace with your Julian day number
$frenchDate = jdtofrench($jd);
echo "The French Republican Calendar date for JD $jd is $frenchDate.";


In the above example, I first convert the Julian day number to a Unix timestamp by subtracting a constant (2440587.5) and multiplying it by the number of seconds in a day. Then, I use the `date()` function to format the timestamp into the desired French Republican Calendar date format. Finally, the function returns the formatted date.

You can simply call this `jdtofrench()` function with your Julian day number as the parameter to get the corresponding French Republican Calendar date.

Hope this helps! Let me know if you have any further questions.

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