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tilwhen date engine

com.tilwhen/tilwhen · v1.0.1

Deterministic date arithmetic with auditable receipts: business days, due dates, holidays.

Connect Remote server

Terminal
claude mcp add --transport http tilwhen https://mcp.tilwhen.com/mcp
~/.cursor/mcp.json
{
  "mcpServers": {
    "tilwhen": {
      "url": "https://mcp.tilwhen.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "tilwhen": {
      "type": "http",
      "url": "https://mcp.tilwhen.com/mcp"
    }
  }
}
Claude Desktop
Settings > Connectors > Add custom connector
URL: https://mcp.tilwhen.com/mcp

Tools 9 found in our last check

  • parse_date_query

    Parses queries like "90 business days from today in uganda" into a normalized operation, answers it, and returns the auditable receipt. Ambiguous dates (03/04/2027) return needsClarification instead of a guess.

  • add_days

    The date N whole calendar days after a date (exclusive counting: the start date is day 0). Omit date for today in tz. For working days use business_days; for the gap between two dates use days_between.

  • subtract_days

    The date N whole calendar days before a date (exclusive counting: the start date is day 0). Omit date for today in tz. For working days use business_days; for the gap between two dates use days_between.

  • days_between

    Signed whole calendar days from the from date to the to date, midnight to midnight in tz: positive when to is later, negative when it is earlier. Endpoints are exclusive, so this is the gap and consecutive dates are 1 apart. Either date may be "today", resolved in tz. For workin…

  • business_days

    Span mode (from+to): business days between two dates, exclusive of the start day, inclusive of the end day. Add mode (days, optional date): the date N business days away. Passing from or to selects span mode and needs both; days and date are then ignored, so add mode takes its s…

  • invoice_due

    Due date for Net-N payment terms (calendar days, invoice date = day 0). Optional roll-forward past weekends and, with a jurisdiction or custom calendar, public holidays.

  • next_occurrence

    The next occurrence strictly after the base date (default today) of either a tracked event slug (e.g. "christmas") or a weekday (0 = Sunday .. 6 = Saturday). Provide exactly one of event/weekday.

  • holidays

    Observed public holidays with the nominal (legal) date and status: rule (statutory) or declared (officially declared for that year). Declared-only holidays are omitted for undeclared years, with a holiday_data_incomplete warning.

  • explain

    Runs any operation and returns the receipt plus human-readable derivation steps. Set op, then pass the fields that operation's own tool takes. Use it when the user asks how an answer was reached.

Details

Endpointhttps://mcp.tilwhen.com/mcp (Streamable HTTP)
First published18 Sep 2026
Last updated18 Sep 2026
Registry namecom.tilwhen/tilwhen

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