PHP | frenchtojd() Function

The frenchtojd() function is a built-in function which converts a French date to a Julian Day Count. The function accepts three parameters in format $month / $day / $year, which represents the date in French republican calendar and converts it to a Julian Day count.

Syntax:

frenchtojd( $month, $day, $year) 

Parameters: The function accepts three mandatory parameters as shown above and described below:

1. $month – This parameter specifies the month number in French calendar. The month number is in range 1-13 inclusive. If a month number in excess of 12 or less than 0 is passed, the Julian day is returned as 0.
2. $day – This parameter specifies the day in French calendar. The day number is in range 1-30 inclusive. If a day number in excess of 31 or less than 0 is passed, the Julian day is returned as 0. Leap years are not taken into consideration
3. $year – This parameter specifies the year in French calendar. The year number is in range 1-14 inclusive. If a year number in excess of 14 or less than 1 is passed, the Julian day is returned as 0. Leap years are not taken into consideration

Return Value: The function returns the French date converted to a Julian Day count.

Examples:

Input : $month=3, $day=11, $year=12
Output : 2379928 

Input : $month=4, $day=8, $year=13
Output : 2380320

Below program illustrate the frenchtojd() function.

Program 1: The program below demonstrates the use of frenchtojd() function.

<?php
// PHP program to demonstrate the
// use of frenchtojd() function

// converts date to julian integer
$jd=frenchtojd(4, 8, 13);

// prints the julian day integer
echo ($jd);
?>

Output:

 2380320

Program 2: The program below demonstrates when day and month out of range.

<?php
// PHP program to demonstrate the
// use of frenchtojd() function

// converts date to julian integer
// month is out of range
$jd=frenchtojd(22, 8, 11);

// prints the julian day integer
echo ($jd), "\n";


// day is out of range
$jd=frenchtojd(4, 32, 11);
echo ($jd);
?>

Output:

0
0

Reference:
http://php.net/manual/en/function.frenchtojd.php