About TimeKit

Our Mission

Time is one of the most fundamental things in human life — yet calculating with dates is surprisingly hard. How old am I exactly? How many days until my vacation? What time is it in Tokyo right now? These questions should have instant answers.

TimeKit was built to provide those answers — free, fast, and without requiring you to create an account or install anything. Every tool works directly in your browser.

What We Offer

• →Age Calculator — find your exact age down to the minute
• →Date Difference Calculator — days, weeks, and months between any two dates
• →Countdown Timer — count down to any upcoming event
• →Time Zone Converter — instantly convert between world time zones
• →Unix Timestamp Converter — translate between timestamps and human dates
• →Working Days Calculator — count business days excluding weekends
• →And many more free tools...

Privacy First

All calculations happen entirely in your browser. We do not collect, store, or transmit any of the dates or personal information you enter into our tools. Your data stays on your device.

Always Free

TimeKit is and will always be free to use. We believe access to basic utility tools should not require payment or registration.

How the calculations work

Every tool runs in your browser and follows published standards rather than approximations:

• Time zone offsets and daylight-saving rules come from the IANA time zone database your browser ships, applied for the specific date in question rather than today's rules.
• Week numbers follow ISO 8601: weeks start on Monday, and week 1 is the week containing the year's first Thursday.
• Leap years follow the Gregorian rule, including the century exception that makes 1900 an ordinary year and 2000 a leap year.
• Date ranges are counted on calendar dates, not elapsed hours, so a range crossing a daylight-saving change is not a day short.
• Unix timestamps are counted from 1 January 1970 UTC, and both the UTC and local rendering of an instant are shown so there is no ambiguity about which you have.

The date arithmetic is covered by a test suite that runs across eight time zones, because the errors that matter most in this domain only appear in some of them.