Time & Date Calculators

Free time and date calculators to help you to track time, countdown to important dates and more.

Date math is deceptively annoying. Months have different lengths, leap years break simple arithmetic, time zones shift answers, and asking how many working days until a deadline adds another layer. Counting days in your head from one Tuesday to a specific Friday seven months away is something humans aren't good at — and getting it wrong by a day can mean missing a deadline, a birthday, or a deposit.

These time and date calculators do the counting precisely. Find the exact number of days, hours, or weeks between two dates; add or subtract time periods from any given date; or run a live countdown to a holiday, birthday, wedding, retirement, or event. Holiday countdown timers stay accurate as the date approaches and reset automatically for the next year. Pick a calculator from the list below for your specific date question.

Time and Date

World Days

International Dates

Lunar Calendar

Countdown Timers

Sports

Western Calendar

FAQs

Use the Days Calculator — enter both dates and it returns the count, automatically handling leap years and different month lengths. By default it counts the days in between (exclusive). If you want to include both endpoints, add 1 to the result.

Countdown timers run in your local browser time, so they're accurate wherever you're viewing them. The target date is fixed (for example, December 25th at 00:00), and your countdown reflects how much time remains in your time zone. People in different time zones see different countdown values for the same target.

Three common reasons: counting inclusive vs exclusive endpoints (does the start date count?), time zone differences across midnight, and ignoring leap years for date ranges spanning February 29. Our calculators count exclusively between dates by default and account for leap years and time zones automatically.

Most generic days-between calculators count calendar days including weekends and public holidays. To count working days specifically, you need to subtract weekends (and optionally holidays) from the total. For a rough estimate, multiply calendar days by 5/7 to approximate working days.

Yes. Once a holiday passes, the countdown automatically rolls over to the same holiday the following year, so the page stays useful year-round. Holidays with shifting dates (Easter, Chinese New Year, Ramadan, Mother's Day) are calculated based on the official rule that determines that year's date.