Best approach for predicting special entity based on surrounding words?

I'm working on a problem where I need to extract a specific date from a page of unstructured text. The issue is that the text can contain multiple dates, but only one is the one I'm interested in.

It is obvious that I need to utilize an approach that considers surrounding words. So far I have attempted training a SpaCy model and BERT.

My pre-processing approach involved splitting the text into sentences, leaving them as whole and length variations in-between. …

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