Using the date as a version number for an application that gets frequent updates is very standard. Most users will be expected to be on the latest version always.
Generally speaking, I find it easier and more intuitive to use. We use calver at work bc it seems pointless to identify if every week's release is major / minor / patch etc. My thought is the latest is the greatest - if something goes wrong, it'll be fixed in a later version ¯\_(ツ)_/¯
It's great to get a quick context of the size of the change expected. That does require the developer numbering the release to appropriately version it though.