PHP | gregoriantojd() Function

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

gregoriantojd( $month, $day, $year)

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

$month – This parameter specifies the month number in Gregorian calendar. The month number is in range 1-12 inclusive. If a month number in excess of 12 or less than 0 is passed, the Julian day is returned as 0.
$day – This parameter specifies the day in Gregorian calendar. The day number is in range 1-31 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
$year – This parameter specifies the year in Gregorian calendar.

Return Value:

Input : $month=3, $day=31, $year=2018 
Output : 2458209

Input : $month=4, $day=27, $year=2018
Output : 2458236

Program 1:

<?php 
// PHP program to demonstrate the 
// use of gregoriantojd() function  
  
// converts date to julian integer  
$jd=gregoriantojd(4, 27, 2018); 
  
// prints the julian day integer 
echo ($jd); 
?> 

Program 2:

<?php 
// PHP program to demonstrate the 
// use of gregoriantojd() function  
  
// converts date to julian integer  
// month is out of range 
$jd=gregoriantojd(4, 32, 2018); 
  
// prints the julian day integer 
echo ($jd), "\n";  
  
  
// day is out of range 
$jd=gregoriantojd(13, 29, 2018); 
echo ($jd);  
?> 