year

Year number of input date and time

Syntax

y = year(t)

y = year(t,yearType)

Description

y = year(t) returns the year number for each date and time in the input array. By default, year returns ISO year numbers, which include a year zero and represent years BCE using negative values.

The output y is a double array. To assign ISO year values to a datetime array, t, use t.Year and modify the Year property.

y = year(t,yearType) returns the type of year number of datetime array t, specified as either "iso" or "gregorian".

Examples

Extract Year Number from Dates

Extract the year numbers from an array of dates.

t = datetime(2010,05,31):calyears(1):datetime(2015,02,28)

t = 1x5 datetime
   31-May-2010   31-May-2011   31-May-2012   31-May-2013   31-May-2014

y = year(t)

y = 1×5

        2010        2011        2012        2013        2014

Input Arguments

t — Input date and time

datetime array

Input date and time, specified as a datetime array.

To support existing code that previously required Financial Toolbox™, year also accepts serial date numbers and text as inputs, but they are not recommended. For more information, see Version History.

yearType — Type of year values

'iso' (default) | 'gregorian'

Type of year values, specified as either 'iso' or 'gregorian'. This argument is valid only when t is a datetime array.

• If yearType is 'iso', then year returns the ISO year number, which includes a year zero and represents years BCE using negative values.

• If yearType is 'gregorian', then year returns the Gregorian year number, which is an unsigned integer. For example, the Gregorian year number for 5 CE and 5 BCE is 5 in both cases. Gregorian year numbers do not have a year zero.

This argument is valid only when t is a datetime array.

Extended Capabilities

Tall Arrays

Calculate with arrays that have more rows than fit in memory.

The year function fully supports tall arrays. For more information, see Tall Arrays.

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

Distributed Arrays

Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).

Version History

Introduced in R2014b

R2022a: Serial date number and text inputs not recommended

Although year supports serial date number and text inputs, datetime values are recommended instead. The datetime data type provides flexible date and time formats, storage out to nanosecond precision, and properties to account for time zones and daylight saving time.

To convert serial date numbers or text to datetime values, use the datetime function. For example:

t = datetime(738427.656845093,"ConvertFrom","datenum");
y = year(t)

y =

        2021

There are no plans to remove support for serial date number or text inputs.

R2022a: year functions from Financial Toolbox and MATLAB combined

In previous releases, there were two year functions: one in MATLAB^® that accepted datetime values, and one in Financial Toolbox that accepted serial date numbers or text values. As of R2022a, you can call year without Financial Toolbox. When you call year from MATLAB, it accepts all previous input types.

For example, you can make these calls with a serial date number and text from MATLAB:

y = year(738427.656845093)

y =

        2021

y = year("28-Sep-2021")

y =

        2021

In addition, year accepts a second input for the date format when the first input is not a datetime array:

y = year(t,F)

In this syntax, specify F using a valid date format as documented for the datestr function, though 'Q' format specifiers are not supported. For example:

y = year("2021/28/09","yyyy/dd/mm")

y =

        2021