How do I display the current year on list date?
Example picture below, only the items modified last year or before have the year displayed.
Not an answer, just extra info when working with past dates
In an extra Calculated Column Year gets you the Year only,
You can then use that in View Filters, Sorts or Group By settings
A list year filter setting would then be:
I tried to use functions in here, but couldn't get it to work
You can't use
=YEAR( [Modified] )
for your formula, because it will be formatted as number with thousands separator.
If its a list view, you can format date column with the help of JSLink. JSLink will help you to conditional format the date.
If its a Display form you can use JSLink or jquery to conditional format the date.