No sign-up
Use every published calculator without creating an account.
Free · No sign-up · Browser-local
Practical tools for global teams.
Count working days, add or subtract business days, understand week systems, and coordinate across time zones—all in your browser.
How calculations workTools
Examples shown · calculations run in your browser
CalendarYear · U.S. federal holidays
Work Days in a Year
See how weekdays, weekends, and federal holidays shape a working year.Example261 → 250 daysDate rangeCustom working rulesBusiness Days Calculator
Count business days between dates, or add and subtract working days.Example12 daysWeek rulesISO · regional · customWeek Number
Find the week number for any date under the rule you actually use.ExampleW33 ISOTime zonesGlobal IANA time zonesTime Zone Meeting Planner
Compare local hours and find a meeting time that shares the inconvenience fairly.Example06:00San Francisco14:00London18:30Bengaluru22:00TokyoPrivate by design
Your dates, locations, and working hours stay in your browser. Privacy
Rules you can verify
See the calendar rules, sources, and coverage behind each result. Data sources
Clear rules behind every answer.
Four focused calculators cover annual United States federal workdays, custom business-day rules, ISO and regional week systems, and global IANA time zones. Every result states its calculation scope, rules, and source review date.