rebar-datetime
Deterministic business-day, holiday & timezone math for 100+ countries — the reliable date logic LLMs hallucinate. No API key, instant answers.
How to pay
Subscribe
$3/month
Predictable monthly cost with included usage. Best for steady, high-volume traffic.
- Unlimited tools within plan limits
- One API key, billed once a month
- Cancel any time
The business-calendar server for AI agents
LLMs are confident — and frequently wrong — about dates. They hallucinate holiday dates, miscount business days across countries, and drift on timezone/DST edges. For agents doing scheduling, billing, payroll, SLAs, or project timelines, that's a silent correctness bug.
rebar-datetime gives your agent deterministic, offline date logic it can trust — no API key, no rate-limited third-party calendar, sub-millisecond answers.
Tools
- datetime_is_holiday — is a date a public holiday? (100+ countries + regional/state calendars, with observed-date handling)
- datetime_holidays_in_range — every holiday between two dates
- datetime_next_business_day — skip weekends + observed holidays
- datetime_business_days_between — count working days (with weekend + holiday breakdown)
- datetime_days_until_next_holiday — scheduling helper
- datetime_convert_timezone — IANA timezone conversion with correct DST handling
- datetime_resolve_relative_date — resolve "next monday", "end of quarter", etc.
Built for real work
SLA deadlines · invoice due-dates · payroll cutoffs · delivery estimates · cross-region meeting scheduling.
The boring, essential date math your agent shouldn't guess at — deterministic, offline, and right every time.