Date & Time Tools
5 tools · 5 available now
Work with dates and durations — working-day counters, countdowns, week numbers, and duration adders.
Working Days Calculator
Count working days between two dates.
Date Countdown
Count down the days to an important date.
Week Number Calculator
Find the ISO week number for any date.
Days Alive Counter
Count exactly how many days you have been alive.
Time Duration Adder
Add up multiple time durations.
About date & time tools
Dates and durations are deceptively tricky to calculate by hand. ToolJutsu's date and time tools count working days while skipping weekends, count down to an important date, find the ISO week number for any date, work out exactly how many days you have been alive, and add up time durations in hours, minutes, and seconds. They are precise, instant, and run entirely in your browser.
Every tool in this category runs entirely on your device. Your files and inputs are never uploaded to a server — there is no server in the loop that touches your data. That makes ToolJutsu a genuinely private way to get everyday tasks done. New tools in this category go live as the project progresses; cards marked “Soon” are on the roadmap.