Tool category
Free Online Date & Time Tools
Date and time calculators for everyday questions: how many days until, how old am I exactly, what time is it in another timezone, and more — all running instantly in your browser.
5 tools in this category
Date Calculator
Calculate the number of days between two dates, or add/subtract days from any date. Handles leap years, weekends, and business days — browser-only.
Open toolAge Calculator
Calculate exact age from a birthdate. Shows years, months, days, total days, weeks, and next birthday countdown — browser-only, instant.
Open toolTime Zone Converter
Convert time between any world time zones. Supports all IANA zones with DST awareness. Find the best meeting time — browser-based, free.
Open toolCountdown Timer
Count down the exact days, hours, minutes, and seconds until any future date or event. Live countdown, shareable link — browser-only.
Open toolDay of the Week
Find what day of the week any date falls on — past, present, or future. Works for any date from year 1 to 9999 — browser-only.
Open toolHow this category works
Date and time tools handle the practical calculations people reach for spreadsheets or search engines to solve — how old am I, how many days until an event, what day of the week was a past date, or what is the same time in another timezone.
Related categories
Frequently asked questions
Does the age calculator include leap years?
Yes. The age calculator uses the JavaScript Date API which handles leap years and variable month lengths correctly.
Which time zones are supported?
All IANA time zones (over 400) are available in the timezone converter using the built-in Intl.DateTimeFormat API.
Does the date calculator account for daylight saving time?
Calculations involving timezone offsets respect DST as defined in the IANA time zone database.