fix(frontend): show local date in history cards (matches displayed time)

[Osamaali313]

Problem

In frontend/src/components/HistoryDatabase.vue, the history card's date and time are derived from different time zones, so they can disagree by up to a day.

const formatDate = (dateStr) => {           // UTC
  const date = new Date(dateStr)
  return date.toISOString().slice(0, 10)
}
const formatTime = (dateStr) => {           // local
  const date = new Date(dateStr)
  return `${date.getHours()...}:${date.getMinutes()...}`
}

created_at is a naive-local timestamp (datetime.now().isoformat()), returned verbatim by the history API. new Date("2026-07-08T01:00:00") is parsed as local; formatTime shows the local clock, but formatDate's toISOString() converts to UTC first. For any non-UTC client the day can shift — e.g. for the project's UTC+8 audience, a record created between 00:00 and 08:00 local shows yesterday's date next to today's time.

Fix

Derive the date from local components, matching formatTime:

const year = date.getFullYear()
const month = String(date.getMonth() + 1).padStart(2, '0')
const day = String(date.getDate()).padStart(2, '0')
return `${year}-${month}-${day}`

Verification

Extracted both helpers and ran them under Node on a UTC+3 machine with the naive timestamp 2026-07-08T01:00:00:

• formatTime → 01:00 (local, July 8)
• Before: formatDate → 2026-07-07 (UTC) — wrong day
• After: formatDate → 2026-07-08 — matches the time shown

Under TZ=UTC the discrepancy disappears in both versions, confirming the time zone was the sole cause. (No frontend test suite exists; happy to add a vitest case if you set one up.)

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