Free Date & Time Tools
Free date and time calculators for the questions calendars make awkward to answer by hand. Work out your exact age in years, months, and days; measure the difference between two dates; count down the days until a deadline, holiday, or event; and convert Unix timestamps to and from readable dates. Each tool handles the fiddly parts correctly — leap years, varying month lengths, and time zones — and explains the counting method it uses (for example, whether the end date is included). Everything runs instantly in your browser with no sign-up. These are precise calendar calculations for planning and reference, not legal or official determinations of age or deadlines.
Find your exact age in years, months, and days from a date of birth, plus your total age in days and a countdown to your next birthday.
Find the time between any two dates — in years, months, and days, and as a total number of days and weeks.
Count how many days are left until a future date, such as a holiday, deadline, birthday, or event.
Frequently asked questions
How is age calculated?
As completed years, months, and days from the start date to today (or any target date), accounting for different month lengths and leap years.
Do these count calendar days or business days?
The date difference tool counts calendar days and shows the exact number of days between two dates.
Do the date tools handle leap years?
Yes. All date calculations account for leap years automatically.