maratoolDate converter tools
Date tools that run locally in your browser.
Age Calculator — Exact Age from Birth Date
Calculate exact age in years, months, and days from a birth date. Updates to today or any target date.
ISO 8601 Date Formatter
Parse and format ISO 8601 dates. Convert between ISO strings, local datetime, and Unix timestamps.
ISO Week Number Calculator
Find the ISO week number for any date. See week start, week end, and year-week label.
Business Days Calculator
Business Days Calculator. Free, instant, runs in your browser.
Working Hours Calculator
Working Hours Calculator. Free, instant, runs in your browser.
Countdown to Date Calculator
Countdown to Date Calculator. Free, instant, runs in your browser.
Days Between Dates
Count the days between two dates, with a years-months-days breakdown, weeks, hours, and business days that skip weekends.