Looking for suggestion on how to use publishTime as admin title

Hi all,

I have a collection of content that gets updated daily, and my plan was to set the title of the documents to the publishDate, perhaps with a prefix identifying the collection type.

If I point useAsTitle at a date field, this error occurs because publishDate is a Date type, not a string:

What I came up with to bypass is use a separate slug field and set its default to the current date:

...
admin: {
    useAsTitle: "slug", // <-- can i tie this directly to publishTime instead of adding a slug property? 
    defaultColumns: ["title", "category", "publishDate", "tags", "status"],
  },
  fields: [
    {
      name: "slug",
      type: "text",
      defaultValue: `${new Date().toLocaleDateString()}`,
      required: true,
    },
    {
      name: "publishTime", // required
      type: "date", // required
      required: true,
    },

... but then there's no guarantee that publishDate and slug will be consistent without a validation step.

Can I do something with a field hook here?

Payload rocks, enjoying digging in — thanks for making it open source!!

Edit:
found these examples of dynamically generated titles/fields in the public demo:

• https://github.com/payloadcms/public-demo/blob/1ac92b8b6a10c1739a25a3edc74fc75cb948f189/src/collections/Pages/index.ts#L124
• https://github.com/payloadcms/public-demo/blob/1ac92b8b6a10c1739a25a3edc74fc75cb948f189/src/collections/Pages/index.ts#L71

... which seem like what I need. Keeping up for viz on how useAsTitle breaks on non-string field types. Is there a validation step that could be built into the config to prevent non-string fields from being set as title? Can help write issue. Again, Payload rocks - these public examples are extensive.