Free Time & Date Calculators
Count days, find dates, convert time zones and keep time. Date calculators, countdowns, timers and clocks for planning, deadlines and everyday questions.
Date math is full of traps: leap years, months of different lengths, weekends, holidays observed on Fridays and Mondays, and week numbers that start on different days. These tools handle the details so you can answer questions like "how many business days until the deadline?" with confidence.
Plan ahead with the days until and business days calculators, check what day of the week a date falls on, convert between time zones and 24-hour time, or keep focused with the Pomodoro timer and stopwatch.
Popular time & date tools
- Date Calculator — days between dates, add or subtract
- Days Until Calculator — countdown to any date
- Age Calculator — exact age in years, months and days
- Business Days Calculator — working days between dates
- Time Zone Converter — convert times between cities
- Pomodoro Timer — focus sessions with breaks
- Online Alarm Clock — alarms with snooze, right in your browser
- Meeting Planner — find a time that suits every time zone
All calculations use your device's local time zone and run privately in your browser.
Time & Date — all tools
Frequently asked questions
Do the calculators handle leap years?
Yes. All date math uses the real calendar, including February 29.
Which time zone is used?
Your device's local time zone, unless a tool lets you choose another.
Which holidays does the business days calculator skip?
The 11 U.S. federal holidays on their observed dates, plus any extra days off you add.