tilwhen date engine
Deterministic date arithmetic with auditable receipts: business days, due dates, holidays.
Little public usage data yet
Reviews
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If you have run it, two minutes of your experience saves the next person an afternoon.
Tools (9)
write = sends, deletes, buys or postsadd_daysFreeThe 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.
business_daysFreeSpan 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. Optional holiday jurisdiction or custom calendar, and a selectable working week.
days_betweenFreeSigned whole calendar days from one date to another, midnight to midnight, endpoints exclusive (the gap).
explainFreeRuns 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.
holidaysFreeObserved 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.
invoice_dueFreeDue 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_occurrenceFreeThe 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.
parse_date_queryFreeParses 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.
subtract_daysFreeThe 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.
Public scan report
scanner v0.1.3 · 2026-09-19 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 514ms20/20
- Tool poisoning9 tool descriptions checked15/15
- Auth qualityopen endpoint, read-only tools10/15
- Maintenanceno repository listed3/15
- Maintainer identityverified namespace with website, no repo4/10
Findings (1)
- lowNo source repository listed
maint.no-repo
Install directly
claude mcp add --transport http tilwhen https://mcp.tilwhen.com/mcp
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