deepseek-ai/deepseek-harness · error · Error

time-context: invalid IANA timeZone ${JSON.stringify(timeZon

Error message

time-context: invalid IANA timeZone ${JSON.stringify(timeZone)}

What it means

Error "time-context: invalid IANA timeZone ${JSON.stringify(timeZone)}" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/context/time-context/src/index.ts:156

/**
 * Register a prepended pre-step listener for the lifetime of `ctx`.
 * @param ctx - plugin context; the listener is disposed with it.
 * @param config - time zone and durable refresh scheduling configuration.
 * @throws when the refresh interval is invalid or the configured or process time zone cannot be resolved.
 */
export function apply(ctx: Context, config: Config): void {
  const timeZone = config.timeZone
  const refreshIntervalMs = config.refreshIntervalMs
  validateRefreshInterval(refreshIntervalMs)
  let fallbackFormatter: Intl.DateTimeFormat
  try {
    fallbackFormatter = createTimestampFormatter(timeZone)
  } catch (error: unknown) {
    const message = timeZone === undefined
      ? 'time-context: failed to resolve the system time zone'
      : `time-context: invalid IANA timeZone ${JSON.stringify(timeZone)}`
    throw new Error(message, { cause: error })
  }
  const fallbackTimeZone = fallbackFormatter.resolvedOptions().timeZone
  const formatters = new Map<string, Intl.DateTimeFormat>([[fallbackTimeZone, fallbackFormatter]])

  /** Resolve and cache one request-local timestamp formatter. */
  const formatterFor = (selectedTimeZone: string): Intl.DateTimeFormat => {
    const existing = formatters.get(selectedTimeZone)
    if (existing !== undefined) return existing
    const created = createTimestampFormatter(selectedTimeZone)
    formatters.set(selectedTimeZone, created)
    return created
  }

  ctx.on('agent/pre-step', async (
    { agent, turn, step, signal },
    next,
  ): Promise<PreStepDecision> => {
    const decision = await next()

View on GitHub (pinned to b150a551b8)

Solutions

1. Use a valid IANA time zone name such as Europe/Berlin.

When it happens

Trigger: Thrown at packages/context/time-context/src/index.ts:156 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/b0eff6c59f8a9626. Report an issue: GitHub.