eomday

Last day of month

Syntax

E = eomday(Y,M)

Description

E = eomday(Y,M) returns the last day of the specified month M in the year Y. The output E is a numeric array. The last day of any month is an integer between 28 and 31, inclusive.

Examples

Last Days of Months

Return the last day of January 2022.

E = eomday(2022,1)

E = 
31

Return the last day of every month in 2022.

E = eomday(2022,1:12)

E = 1×12

    31    28    31    30    31    30    31    31    30    31    30    31

Find Leap Years

The eomday function accounts for leap years. In a leap year, February has an extra day, February 29. For example, 2020 is a leap year.

E = eomday(2020,2)

E = 
29

Find all the leap years between 2000 and 2020. First create an array of year numbers. Then use eomday to find the years when February has 29 days.

Y = 2000:2020;
E = eomday(Y,2);
leapYears = Y(E == 29)

leapYears = 1×6

        2000        2004        2008        2012        2016        2020

Input Arguments

Y — Year number

integer array

Year number, specified as an integer array.

Example: E = eomday(2020,12) specifies 2020 as the year number.

Example: E = eomday(2000:2020,12) specifies an array of year numbers.

M — Month number

integer array

Month number, specified as an integer array where each element is an integer between 1 and 12, inclusive. The month numbers correspond to the months listed in the table.

Month Number	Month Name
1	January
2	February
3	March
4	April
5	May
6	June
7	July
8	August
9	September
10	October
11	November
12	December

Example: E = eomday(2020,12) specifies 12 as the month number.

Example: E = eomday(2020,1:6) specifies an array of month numbers.

Version History

Introduced before R2006a