Date & Time Tools
Age, duration, workdays, timezones and timestamp conversion — date math that accounts for leap years and weekends.
37 free tools in this collection.
Most-used in this category
Age Calculator
Date & Time
Age calculator online: free, unlimited, no signup. Accuracy notes and worked examples included. US-friendly and works everywhere.
Open toolAdd/Subtract Days Calculator
Date & Time
Try this free add days to date: instant, browser-based, no dark patterns. Methodology documented, examples verified, privacy total.
Open toolDate Difference Calculator
Date & Time
Free date difference calculator that runs instantly in your browser — private, no signup, no uploads. Built for US and worldwide users.
Open toolTime Zone Converter
Date & Time
Try this free time zone converter: instant, browser-based, no dark patterns. Methodology documented, examples verified, privacy total.
Open toolWorking Days Calculator
Date & Time
A working days calculator built for speed: results appear as you type. Runs client-side so your input stays yours. Free, no account required.
Open toolCountdown Timer to Date
Date & Time
Countdown calculator online: free, unlimited, no signup. Accuracy notes and worked examples included. US-friendly and works everywhere.
Open toolTime Duration Calculator
Date & Time
Time duration calculator that just works — free, instant, private. Full formula transparency and real examples. No signup, US or global use.
Open toolMilitary Time Converter
Date & Time
Fast, private military time converter: everything is computed locally in your browser. Free for US and international users, no account needed.
Open toolTime Card Calculator
Date & Time
Time card calculator — free, instant and honest about its math. Real worked examples included. No signup, no uploads, works worldwide.
Open toolWeek Number Calculator
Date & Time
A week number built for speed: results appear as you type. Runs client-side so your input stays yours. Free, no account required.
Open tool