From when is the official date of joining a company calculated?

Good day, Dr. Ayman!

Inshallah, you are doing pretty well. I have a question, please!

From when do they calculate your official date of joining? Is it from the date you joined based on the contract between you and the employer or from when the visa was issued?

I have a case with a firm and they are claiming in their defense that my date of joining is from when my visa was issued. To make it easier: I joined work on 24th June 2018 - The last day was on 7th July 2019.

The company is referring based on the labor contract (limited). It says that the contract is from the date I entered the country which is 26th July 2018. Although I was here and I started work on 24th June 2018. (I was terminated and the company is not claiming that).

Thank you!