The easiest way to convert text to a year in Excel is with the TEXT function. It takes value as the first argument and formatting as the second.
TEXT(value, format_text)
You can use the following formula to convert the date in Cell A2 and display it as a year only.
=TEXT(A2,"yyyy")

You can also display the last two digits of the year by using this formula.
=TEXT(A2,"yyyy")
You can also use the text formula to display months, days, hours, minutes and seconds, and separate them with a dash, slash, or any other separator.
You can combine this date with text to make it more readable.
="The year is "&B2&"."

And with the CONCAT function.
=CONCAT("The year is ",B2,".")
Here’s a table with different formats.
Format | Definition |
yyyy / yyy | A year with four digits (1998, 2019, etc.) |
yy / y | A year with two digits (98, 19, etc.) |
mm | A month with leading zero (05, 12, etc.) |
m | A month without leading zero (5, 12, etc.) |
dd | A day with leading zero (05, 12, 30, etc.) |
d | A day without leading zero (5, 12, 30, etc.) |