test(fleet): use local wall time for planned delivery fixture

scripts/fleet-capacity-pool-test-env.mjs

@@ -15,7 +15,12 @@ const id = value => String(value ?? ''), requireThat = (ok, reason) => { if (!ok
 const success = response => response?.http === 200 && id(response.body?.code) === '200'
 const denied = response => [403, 409].includes(response?.http) || response?.http === 200 && ['A0403', 'A0409'].includes(id(response.body?.code))
 const encode = encodeURIComponent
-const localTime = ms => new Date(Date.now() + ms).toISOString().slice(0, 19)
+// DeliveryRequests.Transfer uses LocalDateTime. Fleet offer/booking Instant fields below retain Z.
+export function poolLocalDateTime(date) {
+  requireThat(date instanceof Date && Number.isFinite(date.getTime()), 'VALID_LOCAL_DATE_REQUIRED')
+  return new Date(date.getTime() - date.getTimezoneOffset() * 60000).toISOString().slice(0, 19)
+}
+const localTime = ms => poolLocalDateTime(new Date(Date.now() + ms))
 const PNG = Buffer.from('iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+aH1kAAAAASUVORK5CYII=', 'base64')
 
 export const POOL_COVERAGE = Object.freeze([

scripts/fleet-capacity-pool-test-env.test.mjs

@@ -1,7 +1,7 @@
 import test from 'node:test'
 import assert from 'node:assert/strict'
 import { parsePoolArguments, poolPlan, runPoolAcceptance, assertPoolRemaining, assertSingleCommercial,
-  shrinkingVehicleRequest, expiryWaitMs, POOL_COVERAGE, POOL_REMAINING } from './fleet-capacity-pool-test-env.mjs'
+  shrinkingVehicleRequest, expiryWaitMs, poolLocalDateTime, POOL_COVERAGE, POOL_REMAINING } from './fleet-capacity-pool-test-env.mjs'
 
 test('default and explicit plans make no network requests or invoke the mutating runner', async () => {
   const original = globalThis.fetch
@@ -95,3 +95,14 @@ test('cutoff wait is bounded and follows the returned instant without negative o
   assert.throws(() => expiryWaitMs('invalid', now), /INVALID_SERVER_CUTOFF/)
   assert.throws(() => expiryWaitMs('2030-01-01T08:10:00Z', now), /BOUNDED_WINDOW/)
 })
+
+test('LocalDateTime transport time keeps actual local wall clock while Instant dates remain zoned', () => {
+  class ShanghaiDate extends Date { getTimezoneOffset() { return -480 } }
+  class LosAngelesDate extends Date { getTimezoneOffset() { return 420 } }
+  const instant = '2030-01-01T20:30:45.123Z'
+  assert.equal(poolLocalDateTime(new ShanghaiDate(instant)), '2030-01-02T04:30:45')
+  assert.equal(poolLocalDateTime(new LosAngelesDate(instant)), '2030-01-01T13:30:45')
+  assert.equal(new ShanghaiDate(instant).toISOString(), instant)
+  assert.equal(new LosAngelesDate(instant).toISOString(), instant)
+  assert.throws(() => poolLocalDateTime(new Date('invalid')), /VALID_LOCAL_DATE_REQUIRED/)
+})