diesjährig
this year's
Referring to the current year or taking place in this year.
Die diesjährige Gewinnerin des Wettbewerbs kommt aus Hamburg.
This year's winner of the competition comes from Hamburg.

this year's
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this year's
Referring to the current year or taking place in this year.
Die diesjährige Gewinnerin des Wettbewerbs kommt aus Hamburg.
This year's winner of the competition comes from Hamburg.

The word is made up of 'dies-' (this) and '-jährig' (relating to the year). The structure is logical and can also be found in words like 'letztjährig' (from last year) and 'nächstjährig' (from next year).
Der diesjährige Winter war besonders mild.
This year's winter was especially mild.
'Diesjährig' (this year's) is used almost exclusively as an attributive adjective, meaning it stands directly before a noun and is declined like any other adjective.
Wir freuen uns auf das diesjährige Firmenjubiläum.
We are looking forward to this year's company anniversary.
The adjective 'diesjährig' (this year's) is typical of written language, for example in newspaper articles, reports, or official announcements. It sounds somewhat more formal.
Der diesjährige Geschäftsbericht wird nächste Woche veröffentlicht.
This year's annual report will be published next week.
current
'aktuell' and 'diesjährig' both refer to something connected with the present. The difference is the time frame. 'aktuell' means that something is valid, happening, or important right now. 'diesjährig' is more specific: it belongs to this year or takes place this year. The words can be confused because this year is also the current time. But not everything current is from this year, and not everything from this year is still current at the moment. If you mean 'right now', use 'aktuell'. If you mean 'in this year', 'diesjährig' fits better.

Das diesjährige Sommerfest der Schule findet im Juli statt.
This year's school summer festival takes place in July.
Im Büro besprechen wir gerade die aktuellen Aufgaben für diese Woche.
At the office, we are currently discussing the current tasks for this week.