gregoriantojd
(PHP 4, PHP 5, PHP 7)
gregoriantojd — Converts a Gregorian date to Julian Day Count
Description
$month
, int $day
, int $year
) : intThe valid range for the Gregorian calendar is from November 25, 4714 B.C. to at least December 31, 9999 A.D.
Although this function can handle dates all the way back to 4714 B.C., such use may not be meaningful. The Gregorian calendar was not instituted until October 15, 1582 (or October 5, 1582 in the Julian calendar). Some countries did not accept it until much later. For example, Britain converted in 1752, The USSR in 1918 and Greece in 1923. Most European countries used the Julian calendar prior to the Gregorian.
Parameters
-
month -
The month as a number from 1 (for January) to 12 (for December)
-
day -
The day as a number from 1 to 31. If the month has less days then given, overflow occurs; see the example below.
-
year -
The year as a number between -4714 and 9999. Negative numbers mean years B.C., positive numbers mean years A.D. Note that there is no year 0; December 31, 1 B.C. is immediately followed by January 1, 1 A.D.
Return Values
The julian day for the given gregorian date as an integer. Dates outside the valid range return 0.
Examples
Example #1 Calendar functions
<?php
$jd = gregoriantojd(10, 11, 1970);
echo "$jd\n";
$gregorian = jdtogregorian($jd);
echo "$gregorian\n";
?>
The above example will output:
2440871 10/11/1970
Example #2 Overflow behavior
<?php
echo gregoriantojd(2, 31, 2018), PHP_EOL,
gregoriantojd(3, 3, 2018), PHP_EOL;
?>
The above example will output:
2458181 2458181
See Also
- jdtogregorian() - Converts Julian Day Count to Gregorian date
- cal_to_jd() - Converts from a supported calendar to Julian Day Count
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-gregoriantojd.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
