Work out the time between two dates, convert a timestamp into something readable, compare time zones across cities, or count down to a deadline. Every calculation runs on your device against your own clock and calendar settings.
5 of 5 tools
Compare times across cities and convert a meeting time between zones.
Work out an exact age in years, months and days, plus the next birthday.
Convert Unix timestamps to dates and back, in seconds or milliseconds.
Add or subtract days from a date, or find the difference between two dates.
Count down to any date and time, with start, pause and reset.
Create strong random passwords with full control over length and characters.
Format, validate and minify JSON, with errors that point to the exact line.
Work out any percentage — of a number, as a share, or as a change.
Find the mean, median, mode and range of a list of numbers, with the working shown.
Sample and population standard deviation and variance, both shown, with the working.
Turn a logo into favicon.ico, the PNG sizes a site needs, and the HTML to declare them.