PHP | jdmonthname() Function

The jdmonthname() function is a built-in function in PHP which returns the month name of a Julian day number passed as the argument. The return value is of six types depending on the mode passed in the function which is explained briefly below in the parameter part. Syntax: 

 jdmonthname($jd, $mode) 

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

1. $jd - This parameter specifies the Julian Day as an integer. It is a mandatory parameter.
2. $mode - This is a mandatory parameter which specifies the type of return value. The mode can be in range 0-5 inclusive.
   • 0 - It returns the abbreviated form (Jan, Feb, Mar, etc.) of month name in Gregorian calendar when mode is passed as 0.
   • 1 - It returns the month name (January, February, March, etc.) in Gregorian calendar when mode is passed as 1.
   • 2 - It returns the abbreviated form (Jan, Feb, Mar, etc.) of month name in Julian calendar when mode is passed as 2.
   • 3 - It returns the month name (January, February, March, etc.) in Julian calendar when mode is passed as 3.
   • 4 - It returns the month name(Tishri, Heshvan, Kislev, etc.) in Jewish calendar when mode is passed as 4.
   • 5 - In returns the month name(Vendemiaire, Brumaire, Frimaire, etc.) in French Republican when mode is passed as 5.

Return Value: The function returns the month name depending on the mode passed. If any value other than 0-5 is passed as mode, then the mode is taken as 0. Examples:

Input : $jd = 2458236, $mode = 0 
Output : Apr
Explanation: In program below we have converted the 
date(4/27/2018) to the Julian Day integer which is 
2458236

Input : $jd = 2457031, $mode = 4 
Output : Tevet
Explanation: date(1/8/2015) in Julian Day integer is 2457031. 
Tevet is the month on this Julian Day integer. 

Below programs illustrate the jdmonthname() function: Program 1: The program below demonstrates the jdmonthname() function when mode is passed as 0. 

Output:

Apr

Program 2: The program below demonstrates the jdmonthname() function when mode is passed as 1. 

Output:

April 

Program 3: The program below demonstrates the jdmonthname() function when mode is passed as 2. 

Output:

Apr

Program 4: The program below demonstrates the jdmonthname() function when mode is passed as 3. 

Output:

April

Program 5: The program below demonstrates the jdmonthname() function when mode is passed as 4. 

Output:

Iyyar

Program 6: The program below demonstrates the jdmonthname() function when mode is passed out of range. 

Output:

Apr

Reference: https://www.php.net/manual/en/function.jdmonthname.php