Function parseNaturalLanguageDateTime

src/utils/mcp/dateTimeParser.ts:23–111

(
  input: string,
  format: 'date' | 'date-time',
  signal: AbortSignal,
)

 * @returns Parsed ISO 8601 string or error message
 */
export async function parseNaturalLanguageDateTime(
  input: string,
  format: 'date' | 'date-time',
  signal: AbortSignal,
): Promise<DateTimeParseResult> {
  // Get current datetime with timezone for context
  const now = new Date()
  const currentDateTime = now.toISOString()
  const timezoneOffset = -now.getTimezoneOffset() // minutes, inverted sign
  const tzHours = Math.floor(Math.abs(timezoneOffset) / 60)
  const tzMinutes = Math.abs(timezoneOffset) % 60
  const tzSign = timezoneOffset >= 0 ? '+' : '-'
  const timezone = `${tzSign}${String(tzHours).padStart(2, '0')}:${String(tzMinutes).padStart(2, '0')}`
  const dayOfWeek = now.toLocaleDateString('en-US', { weekday: 'long' })

  // Build system prompt with context
  const systemPrompt = asSystemPrompt([
    'You are a date/time parser that converts natural language into ISO 8601 format.',
    'You MUST respond with ONLY the ISO 8601 formatted string, with no explanation or additional text.',
    'If the input is ambiguous, prefer future dates over past dates.',
    "For times without dates, use today's date.",
    'For dates without times, do not include a time component.',
    'If the input is incomplete or you cannot confidently parse it into a valid date, respond with exactly "INVALID" (nothing else).',
    'Examples of INVALID input: partial dates like "2025-01-", lone numbers like "13", gibberish.',
    'Examples of valid natural language: "tomorrow", "next Monday", "jan 1st 2025", "in 2 hours", "yesterday".',
  ])

  // Build user prompt with rich context
  const formatDescription =
    format === 'date'
      ? 'YYYY-MM-DD (date only, no time)'
      : `YYYY-MM-DDTHH:MM:SS${timezone} (full date-time with timezone)`

  const userPrompt = `Current context:
- Current date and time: ${currentDateTime} (UTC)
- Local timezone: ${timezone}
- Day of week: ${dayOfWeek}

User input: "${input}"

Output format: ${formatDescription}

Parse the user's input into ISO 8601 format. Return ONLY the formatted string, or "INVALID" if the input is incomplete or unparseable.`

  try {
    const result = await queryHaiku({
      systemPrompt,
      userPrompt,
      signal,
      options: {
        querySource: 'mcp_datetime_parse',
        agents: [],
        isNonInteractiveSession: false,
        hasAppendSystemPrompt: false,
        mcpTools: [],
        enablePromptCaching: false,
      },
    })