PHP cal_from_jd() Function: Usage and Examples

Converts a Julian day number into a date in the requested calendar.

What Is cal_from_jd() in PHP?

Converts a Julian day number into a date in the requested calendar.

Its syntax is:

cal_from_jd(int $julian_day, int $calendar): array

Parameters:

• $julian_day — Accepted as int; required argument.
• $calendar — Accepted as int; required argument.

Return type: array. A Julian day number is a day count, not a UNIX timestamp. Calendar selection changes the fields.

Availability: Requires the calendar extension.

Example 1: Basic Usage

<?php

print_r(cal_from_jd(2460000, CAL_GREGORIAN));

Output:

Array
(
    [date] => 2/24/2023
    [month] => 2
    [day] => 24
    [year] => 2023
    [dow] => 5
    [abbrevdayname] => Fri
    [dayname] => Friday
    [abbrevmonth] => Feb
    [monthname] => February
)

A Julian day number is a day count, not a UNIX timestamp. Calendar selection changes the fields.

Example 2: A Different Input

<?php

echo cal_from_jd(2460000, CAL_JEWISH)["date"];

Output:

7/3/5783

A Julian day number is a day count, not a UNIX timestamp. Calendar selection changes the fields.

Practical Example: Applying It in a Program

<?php

$julianDays = [2460000,2460001]; foreach ($julianDays as $julianDay) { $dateParts = cal_from_jd($julianDay, CAL_GREGORIAN); echo $dateParts["date"] . PHP_EOL; }

Output:

2/24/2023
2/25/2023

A Julian day number is a day count, not a UNIX timestamp. Calendar selection changes the fields.

Important Behavior and Edge Cases

• Key behavior: A Julian day number is a day count, not a UNIX timestamp. Calendar selection changes the fields.
• Environment: Requires the calendar extension.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• Converts a Julian day number into a date in the requested calendar.
• A Julian day number is a day count, not a UNIX timestamp. Calendar selection changes the fields.
• Requires the calendar extension.

Summary: A Julian day number is a day count, not a UNIX timestamp. Calendar selection changes the fields.