[JS] date/time formats in schema cause error

[sqrrrl]

Describe the bug
Using z.date() or z.string().datetime() in an input schema results in an error when calling a tool or flow.

TRPCClientError: unknown format "date-time" ignored in schema at path "#/properties/start"
at n.from (http://localhost:4000/main-ZXY5OYEA.js:17:517771)
at http://localhost:4000/main-ZXY5OYEA.js:17:521774
at u.invoke (http://localhost:4000/polyfills-QXL6O4PO.js:16:6385)
at Object.onInvoke (http://localhost:4000/chunk-XINN327K.js:22:79627)
at u.invoke (http://localhost:4000/polyfills-QXL6O4PO.js:16:6325)
at Y.run (http://localhost:4000/polyfills-QXL6O4PO.js:16:1715)
at http://localhost:4000/polyfills-QXL6O4PO.js:17:554
at u.invokeTask (http://localhost:4000/polyfills-QXL6O4PO.js:16:7010)
at Object.onInvokeTask (http://localhost:4000/chunk-XINN327K.js:22:79443)
at u.invokeTask (http://localhost:4000/polyfills-QXL6O4PO.js:16:6931)

To Reproduce

import { defineTool, generate } from '@genkit-ai/ai';
import { action, configureGenkit } from '@genkit-ai/core';
import { defineFlow, startFlowsServer } from '@genkit-ai/flow';
import { gemini15ProPreview } from '@genkit-ai/vertexai';
import * as z from 'zod';
import { vertexAI } from '@genkit-ai/vertexai';
import 'dotenv/config'

configureGenkit({
  plugins: [
    vertexAI({ location: 'us-central1' }),
  ],
  logLevel: 'debug',
  enableTracingAndMetrics: true,
});


const getSchedule = defineTool(
  {
    name: 'calendar',
    description: 'Retrieves a users schedule for a time range',
    inputSchema: z.object({
      start: z.string().datetime(),
      end: z.string().datetime(),
    }),
    outputSchema: z.array(z.object({
      startTime: z.string(),
      endTime: z.string(),
      summary: z.string()
    }))
  },
  async({start, end}) => {
    console.log("Fetching calendar for", start, end);

    return [
    {
      "startTime": "2024-05-20T08:00:00",
      "endTime": "2024-05-20T09:30:00",
      "summary": "Team Meeting - Q2 Goals Review"
    },
    {
      "startTime": "2024-05-20T10:00:00",
      "endTime": "2024-05-20T11:00:00",
      "summary": "Client Call - Project X Kickoff"
    },
    {
      "startTime": "2024-05-20T14:00:00",
      "endTime": "2024-05-20T15:30:00",
      "summary": "Budget Planning Session"
    },
    {
      "startTime": "2024-05-21T09:00:00",
      "endTime": "2024-05-21T10:00:00",
      "summary": "1:1 with Sarah - Performance Review"
    },
    {
      "startTime": "2024-05-21T11:00:00",
      "endTime": "2024-05-21T12:30:00",
      "summary": "Webinar - Marketing Trends in 2024"
    },
    {
      "startTime": "2024-05-21T15:00:00",
      "endTime": "2024-05-21T16:00:00",
      "summary": "Doctor's Appointment"
    },
    {
      "startTime": "2024-05-22T10:30:00",
      "endTime": "2024-05-22T12:00:00",
      "summary": "Product Demo - Client Z"
    },
    {
      "startTime": "2024-05-22T14:30:00",
      "endTime": "2024-05-22T15:30:00",
      "summary": "Interview - Potential New Hire"
    },
    {
      "startTime": "2024-05-23T13:00:00",
      "endTime": "2024-05-23T14:30:00",
      "summary": "Lunch with Board Members"
    }
  ]
}
);

export const testToolFlow = defineFlow(
  {
    name: 'toolTest',
    inputSchema: z.string(),
    outputSchema: z.string(),
  },
  async (input) => {
    const llmResponse = await generate(  {
      prompt: `How much free time do I have on 5/22/2024 between 9am and 5pm`,
      model: gemini15ProPreview,
      config: {
        temperature: 1,
      },
      tools: [getSchedule],
    });
    return llmResponse.text()
  }
);

startFlowsServer();

Expected behavior

Genkit understands all common zod types.

Screenshots
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Runtime (please complete the following information):

• OS: [e.g. Linux, MacOS]
• Version [e.g. 22]

** Node version

• run node --version at paste here

Additional context
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