Date & Time Tools
The date math that's annoying to do by hand — exact age in years and days, time left until an event, the gap between two dates, or what a raw timestamp actually means — solved instantly.
Age Calculator
Get exact age in years, months, and days, plus totals and next birthday countdown.
OpenCountdown Timer
Live countdown in days, hours, minutes, and seconds to a date you pick.
OpenDate Difference Calculator
Calendar-accurate years/months/days between two dates, plus total days and weeks.
OpenTimestamp Converter
Two-way conversion between Unix timestamps (seconds or ms) and local/UTC/ISO dates.
OpenAge Calculator gives your exact age in years, months, and days from a birth date — useful for form fields that want precision beyond "years old", or just satisfying curiosity about exact age down to the day. Countdown Timer counts down to any future date and time, for a deadline, event, or launch. Date Difference Calculator finds the exact number of days, weeks, or months between any two dates — for contract terms, project timelines, or just settling an argument about how long ago something happened. Timestamp Converter turns a Unix timestamp (the number of seconds since 1970 that most systems and APIs use internally) into a readable date and back.
These come up constantly for developers debugging a timestamp in a log file, for anyone planning around a deadline, or for filling out a form that demands an exact date calculation nobody wants to do with a calendar and a pen.
All four are pure date math running in your browser's JavaScript engine — instant, accurate to the day (or second, for timestamps), with no server involved.
What you can use it for
- Find your exact age in years, months, and days for a form or ID application
- Count down to a wedding, deadline, launch date, or any future event
- Calculate the exact number of days or months between two dates
- Convert a Unix timestamp from a log file or API response into a readable date
- Convert a readable date back into a Unix timestamp for a script or database query
Frequently asked questions
Does the age calculator account for leap years?
Yes — it calculates based on actual calendar dates, which correctly accounts for leap years and varying month lengths rather than a simplified 365-day-year approximation.
What time zone does the timestamp converter use?
It shows the result in your browser's local time zone by default, since that's what's relevant for most uses — check the specific option if you need UTC instead.
Is a Unix timestamp the same everywhere?
The underlying number (seconds since January 1, 1970 UTC) is universal, but how it displays depends on time zone. Two systems showing "different" times for the same timestamp are usually just displaying it in different time zones.
Can Date Difference Calculator handle dates in the past?
Yes — it works for any two dates, past, present, or future, and always returns the absolute difference between them.