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mcal_day_of_year — Returns the day of the year of the given date


int mcal_day_of_year(year, month, day);
int year: The year of the date
int month: The month of the date
int day: The day of the date


The day of the year (1 - 366) of the given date, or -1 on an error


mcal_day_of_year() determines the day of the year that the given date occurs on. It takes leap years into account. This is often useful if you need to determine how many days are between two dates. If the date is invalid, the function will return -1.


PHP 3 since 3.0.13, PHP 4 since 4.0b4


Example 701. Determining the number of days between two dates

$year = 2000;
$month1 = MCAL_MAY;
$day1 = 23;
$day2 = 25;

$days1 = mcal_day_of_year($year, $month1, $day1);
$days2 = mcal_day_of_year($year, $month2, $day2);

// If the two dates are in different years, then
// you'll need to add logic to take that into account.
$difference = abs($days1 - $days2);
echo "There are $difference days between the two dates";

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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