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unixtojd — Converts a UNIX timestamp to a Julian day count.


int unixtojd([timestamp]);
int timestamp (optional): UNIX timestamp


Julian day count


unixtojd() converts a UNIX timestamp to a Julian day count. If no timestamp is given, the function returns the Julian day count for the current timestamp.


As of PHP 4.0.4, this function behaves oddly if given a timestamp less than 0. Filtering the input to ensure that a valid timestamp is being passed to the function is a good idea.


Available in PHP 4.0.0 RC 2

For more information on the UNIX epoch, visit and search for epoch.

See also

To convert a Julian day count to a UNIX timestamp date:


To convert a Julian day count to another calendar system:

See the other jdto*() functions


Example 82. Display the Julian day count that corresponds to the UNIX epoch

echo 'The Julian day count for the start of the UNIX epoch is ' . unixtojd (1);

Example 83. Ensure that the timestamp passed to unixtojd() is valid

function filtered_unixtojd ($timestamp = FALSE) {
    if ($timestamp < 0 || $timestamp > 2138832000)
        return FALSE;

    if ($timestamp)
                return unixtojd ($timestamp);

    return unixtojd ();

echo filtered_unixtojd (99232000);

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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