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juliantojd — Converts a Julian date to a Julian day count.


int juliantojd(month, day, year);
int month: Month
int day: Day
int year: Year


Julian day count


juliantojd() converts from a Julian calendar-formatted date to a Julian day count. The range covered is huge, from 4713 B.C. to 9999 A.D.


PHP Version: 3+, 4+

See also

To convert a Julian day count to a Julian calendar date:


To convert a Julian day count to another calendar system:

See the other jdto*() functions


Example 81. Find the Julian day count for the infamous "Ides of March"

    "Beware the ides of March.", Act i, Scene 2, Julius Caesar by W. Shakespeare

    The Ides of March occur on the 15th of the month.
    Also, month lengths in the Julian calendar did not stabilize until 8 AD, so
    our Julian day count may be off by a wee bit. :)
echo juliantojd (3, 15, -44);

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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