When does my employer coverage actually end? - what worked for you?

I was told my coverage ends on my last day, but the letter says the end of the month. I have read a lot of threads here and could not find my exact situation. The letter is unclear about dental and vision.

Ask HR to confirm the exact date in writing. I also called the insurance company to double-check.

Keep everything in writing and save the confirmation numbers. It saved me later.