tilwhen date engine
Calculate business days, due dates, and holidays with auditable receipts across jurisdictions.
Deterministic date arithmetic for invoices, payment terms, and deadlines. Handles business days, public holidays in US, UK, Ireland, France, Canada, Australia, and Uganda, with custom calendars and working week options.
Try asking Muse: "What's the due date for a Net 30 invoice issued today, rolling forward past weekends and holidays in the UK?"
Source: Found in the official MCP Registry (com.tilwhen/tilwhen) · First listed September 24, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 2 h ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://mcp.tilwhen.com/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 373ms. Worked in 100% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 9
parse_date_queryParses 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_daysThe 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_daysThe 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_betweenSigned 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 workingbusiness_daysSpan 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 stinvoice_dueDue 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_occurrenceThe 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.holidaysObserved 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.explainRuns 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.Recent checks
Link
https://mcp.tilwhen.com/mcpQuestions about tilwhen date engine in Muse
How do I connect tilwhen date engine to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use tilwhen date engine to help me. It is a free service with an MCP server at https://mcp.tilwhen.com/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is tilwhen date engine working right now?
At the last check (September 28, 2026, 07:31 UTC) the endpoint was working, answering in 373ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is tilwhen date engine safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can tilwhen date engine do in Muse?
It exposes 9 tools, including parse_date_query, add_days, subtract_days, days_between. For example, you could ask Muse: "What's the due date for a Net 30 invoice issued today, rolling forward past weekends and holidays in the UK?"
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