I found this sentence:


What is the meaning of that か in 「事だかわからない」? Is it there to add a "uncertainty" nuance? or is it something else?


This か is a question marker, and いつの事だか is an embedded question.

As the above link says, it's okay to have だ before か in embedded questions, and the が between the noun and わかる is usually dropped.

  • いつのこと(だ)?: "When was it?" (an ordinary question)
  • いつのことだ: "when it was" (an embedded question, now a noun clause)
  • いつのことだかわからない: "I don't know when it was"

I saw a dream that night. I don't remember when I saw it, but there was a scenery I do remember.

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