Chronos - Date, Time and Calendar Tools
Deterministic date, time and calendar tools for agents over MCP.
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What it can do
- Describe Date: Get full deterministic facts about a calendar date: weekday, ISO week, day-of-year, leap year, weekend flag. LLMs frequently miscompute the weekday of a date — use this for ground truth
- Date Difference: Exact difference between two dates: total days/weeks AND a years/months/days breakdown that correctly accounts for leap years and varying month lengths.
- Business Days Between: Count business days (Mon–Fri) between two dates, optionally excluding holiday dates. Counts the open interval (from, to].
What data it sees
Do you need an account
No: the server works without sign-in
Deterministic date, time and calendar tools for agents over MCP. Parse and format dates, convert time zones, add and diff durations, compute week numbers, business days and calendar arithmetic. Pure computation: no AI, no API keys, no outbound calls, and the same input always returns the same result.
Server tool list (7)
Raw names from tools/list. Only developers need these.
| describe_date | Get full deterministic facts about a calendar date: weekday, ISO week, day-of-year, leap year, weekend flag. LLMs frequently miscompute the weekday of a date — use this for ground truth. |
| date_difference | Exact difference between two dates: total days/weeks AND a years/months/days breakdown that correctly accounts for leap years and varying month lengths. |
| business_days_between | Count business days (Mon–Fri) between two dates, optionally excluding holiday dates. Counts the open interval (from, to]. |
| add_days | Add (or subtract, with a negative value) a number of days to a date. Set business=true to skip weekends and supplied holidays. |
| nth_weekday_of_month | Find the Nth weekday of a month, e.g. "3rd Monday of January 2026" (MLK Day) or the last Friday (nth=-1). weekday: 0=Sun..6=Sat. |
| age | Exact age (years, months, days, total days) of a birth date as of a given reference date. as_of is required — the tool never reads a wall clock, keeping every result reproducible. |
| convert_timezone | Convert an instant (ISO-8601 with offset, or unix seconds) into a target IANA time zone, with DST-correct offset. Returns local datetime, offset, weekday and unix ts. |