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I have a small query. Are these two sentences given below have the same meaning?

1.I didn't realise it at that time.

2.I haven't realised it at that time.

Thanks
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Only the first sentence is correct.

CB
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why the sentence 'I haven't realised it at that time' is incorrect ?Is t grammatically incorrect
Both sentences refer to a point in time in the past,

'a point in time in the past' is one of the cases in which the simple past must be used.