PHP cal_to_jd() function (with example)

Hey there!

I've actually used the `cal_to_jd()` function in one of my projects before, so I might be able to help you out.

The `cal_to_jd()` function in PHP is used to convert a given date in the calendar format to Julian Day Count. It takes three parameters: the calendar system (like CAL_GREGORIAN for the Gregorian calendar), the month, and the day. This function returns the Julian Day Count for the specified date.

Here's an example that demonstrates how the `cal_to_jd()` function can be used:

php
$calendarSystem = CAL_GREGORIAN;

$month = 10; // October

$day = 31;



$jd = cal_to_jd($calendarSystem, $month, $day);



echo "Julian Day Count for October 31st: " . $jd;

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Hey folks,

I stumbled upon this thread and thought I'd add my two cents regarding the `cal_to_jd()` function in PHP.

In one of my recent projects, I had to work with different calendar systems and needed a way to convert dates to Julian Day Count. That's when I discovered the `cal_to_jd()` function. It's a lifesaver!

The `cal_to_jd()` function takes three parameters: the calendar system, the month, and the day. You can specify the calendar system using constants like CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH, and so on. Then, simply provide the month and day you want to convert to get the Julian Day Count.

To better illustrate, here's an example using the Islamic calendar:

php
$calendarSystem = CAL_ISLAMIC;

$month = 9; // Muharram

$day = 1;



$jd = cal_to_jd($calendarSystem, $month, $day);



echo "Julian Day Count for the Islamic date 1 Muharram: " . $jd;

Hello everyone,

I came across this thread and wanted to share my experience with using the `cal_to_jd()` function in PHP.

While working on a historical research project, I needed to convert some historical dates to Julian Day Count for calculations and comparisons. The `cal_to_jd()` function played a crucial role in simplifying this process.

To utilize this function, you need to provide the calendar system, month, and day as parameters. The calendar system can be specified using constants like CAL_JULIAN, CAL_GREGORIAN, or CAL_JEWISH, depending on the date system you are working with.

Here's an example showing how you can use `cal_to_jd()` to convert a Julian date to Julian Day Count:

php
$calendarSystem = CAL_JULIAN;

$month = 3;

$day = 15;



$jd = cal_to_jd($calendarSystem, $month, $day);



echo "The Julian Day Count for March 15th (Julian calendar) is: " . $jd;

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