Return the current deterministic time. Do NOT let the LLM infer the current date/time — call this tool instead. Returns UTC and local time, weekday, UTC offset, and DST status.

Resolve a natural-language date/time expression into a deterministic ISO timestamp. Use this whenever the user mentions relative dates ('tomorrow', 'next Friday', 'in two weeks', 'the first Monday of next month'). The LLM interprets the language; this tool performs the actual temporal computation. Returns structured result with UTC, local, and precision info.

Perform deterministic date arithmetic: add/subtract units, snap to day/week/month/quarter/year boundaries, or compute differences between dates. Handles leap years and month-end edge cases correctly. Example: 2026-01-31 + 1 month → 2026-02-28.

Convert a datetime between IANA timezones. Correctly handles DST transitions and date-boundary changes. Never hardcodes UTC offsets. Use IANA timezone names (e.g. 'America/New_York', 'Asia/Tokyo'). Can convert to multiple timezones at once.

Get deterministic timezone information: UTC offset, DST status, abbreviation, and next/previous DST transitions. Uses the IANA timezone database. Handles zones with no DST correctly.

Business-day calculations: check if a date is a business day, find next/previous business day, add business days, count business days between dates. Supports configurable weekends and public holidays by country (US, UK, DE, JP, IR, UAE, etc.). Does NOT assume Saturday/Sunday weekend globally.

Public holiday intelligence: list all holidays for a country and year, check if a specific date is a holiday, find the next upcoming holiday, or get holidays in a date range. Supports 100+ countries via the IATA holiday database. Distinguishes between actual and observed holiday dates.

Generate recurring date schedules using RFC 5545 RRULE. Supports natural language patterns ('every Monday', 'first Friday of every month', 'every 90 days') converted deterministically to RRULE where possible. Always generates bounded results within a date range. Never generates infinite recurrences.

Calendar system operations: convert between Gregorian, Persian/Jalali, and ISO week calendars. Validate dates, get weekday information, generate month calendars. Persian/Jalali is a first-class supported calendar.

Deterministically format a datetime string. Supports ISO 8601, RFC 3339, locale-aware formats (en-US, de-DE, ja-JP, fa-IR, etc.), Jalali, human-readable, and custom Luxon format strings. Use Intl.DateTimeFormat for locale-specific output.

Verify a temporal claim deterministically. Prevents temporal hallucinations by checking facts like: 'Is 2026-12-31 a Thursday?', 'Is December 25 2027 a Saturday?', 'Is 3 PM London before 10 AM New York?', 'Is 2024 a leap year?'. Always returns structured facts.

Persian/Jalali calendar operations: convert dates, look up events, get month overviews, calculate days until Jalali dates. This is a convenience wrapper for Jalali-specific functionality. For universal calendar operations, use the 'calendar' tool instead.