YEAR (Transact-SQL)
Applies to: 
SQL Server (all supported versions) 
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Parallel Data Warehouse
Returns an integer that represents the year of the specified date.
For an overview of all Transact-SQL date and time data types and functions, see Date and Time Data Types and Functions (Transact-SQL).
Transact-SQL Syntax Conventions
Syntax
YEAR ( date ) Arguments
date
Is an expression that can be resolved to a time, date, smalldatetime, datetime, datetime2, or datetimeoffset value. The date argument can be an expression, column expression, user-defined variable or string literal.
Return Types
int
Return Value
YEAR returns the same value as DATEPART (year, date).
If date only contains a time part, the return value is 1900, the base year.
Examples
The following statement returns 2010. This is the number of the year.
SELECT YEAR('2010-04-30T01:01:01.1234567-07:00'); The following statement returns 1900, 1, 1. The argument for date is the number 0. SQL Server interprets 0 as January 1, 1900.
SELECT YEAR(0), MONTH(0), DAY(0); Examples: Azure Synapse Analytics (SQL Data Warehouse) and Parallel Data Warehouse
The following statement returns 1900, 1, 1. The argument for date is the number 0. SQL Server interprets 0 as January 1, 1900.
SELECT TOP 1 YEAR(0), MONTH(0), DAY(0);