Date calculators that get the calendar right

Six small tools for counting days, finding dates, and planning around weekends and federal holidays. Everything runs in your browser. There are no accounts, no ads, and no cookies.

• Days between datesTotal days, weeks, and a years-months-days breakdown, with an option to count the end date.
• Add or subtract timeMove a date by days, weeks, months, or years. Month-end dates are handled correctly.
• Age calculatorExact age in years, months, and days, running totals, and a countdown to the next birthday.
• Business daysCount workdays between two dates or add workdays to a date, skipping weekends and optional federal holidays.
• U.S. federal holidaysEvery federal holiday for any year since 1971, with the actual date and the observed day off.
• Countdown timerA live countdown to any date and time in any time zone, with a link you can share.

Why these results can be trusted

Date math is done on plain calendar dates, not on clock times, so a daylight-saving change can never add or lose a day. Federal holidays are worked out from the rules in federal law each time you ask, rather than read from a list that might go stale. The About page explains each method.

Every result is saved in the page address, so you can bookmark it or send it to someone and they will see the same numbers.