Cannot use 'contains' operator with dates

Hello Zotero devs and fellow users,

I'm trying to standardize the date entries in my library to YYYY-MM-DD, but I cannot do an advanced search for "date contains /" or do the equivalent search directly in Javascript because 'contains' is not listed as one of the valid operators for dates:

I don't want to modify the database directly and would rather make the modifications using the JavaScript interface (or, indeed, a bulk-edit interface).

How do you recommend I solve this problem?

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