difference between dates and grouping the results by another dimension

can someone help me with how to find the difference between 2 dates? date_diff() or diff_days() is not working apparently in Looker somehow.

I am trying to find ${leaving_date}-${inserted_date}, these 2 are timestamps (yyyy-mm-dd 00:00:00) and lies in 2 different views in my looker. really appreciate it if someone could help me on this!

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