Time Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks and years.
Processing: This tool runs entirely in your browser. Your input and any file you open stay on your device — nothing is uploaded to a server.
How to use the time converter
- Type the amount you want to convert.
- Choose the unit you have and the unit you want.
- Read the result, or use the table showing all 8 units at once.
About this tool
This converts durations — how long something lasts — rather than points in time. For a timestamp or a date, use the Unix timestamp converter instead.
Units up to a week are exact. Months and years are not: a month here is 30 days and a year 365, which is right for a rough figure and wrong for anything contractual, since real months run 28–31 days and leap years add one.
Common uses
- Converting a timeout given in milliseconds.
- Turning a project estimate from hours into working days.
- Checking how many minutes a long duration is.
Frequently asked questions
- How many seconds are in a day?
- 86,400 — 24 × 60 × 60. Leap seconds occasionally add one, but no operating system exposes that in ordinary arithmetic.
- Why is the year approximate?
- It uses 365 days. A calendar year averages 365.2425 days once leap years are counted, so long spans drift.
Related tools
Unix Timestamp Converter
Convert Unix timestamps to human dates and back, in local time and UTC, with ISO 8601 output.
Age Calculator
Calculate exact age in years, months and days, plus total days and the next birthday.
Speed Converter
Convert between km/h, mph, metres per second and knots.
Data Storage Converter
Convert between bytes, kilobytes, megabytes, gigabytes and their binary equivalents.