German term (edited): Die ausgesprochene Kündigung

my tip, HTH

German term (edited): Die ausgesprochene Kündigung

The resignation given ... (I take it we are seeing this from the point of view of the person resigning).

Or more naturally: My/this resignation takes effect from

Or (if this is the resignation letter): The resignation hereby given takes effect from ...

I hereby tender my resignation, to take effect from ...

You don't necessarily need a word-for-word translation to get the facts across.

I'm guessing that this was initially a verbal resignation, followed by a written resignation.