I've tried googling both spinner and dial, but they turn up results that are not this. I need to implement this in a website, and would like to know the pattern for it -- it's just so much easier to use than drop downs on mobile. Thanks in advance!
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They are just called date pickers in iOS guidelines. Android generally terms them Pickers for both date and time.
These are just customizations of already existing spinners. Essentially, the underlying concept is the same. Only the visual representation is different. So, as far as I researched I don't think they are named different.
In another stack exchange question, it was called Spinner based date pickers. Link provided above for reference