Date & Time Tools

Work out ages, durations, dates and deadlines without doing calendar math in your head. These tools run entirely in your browser, so the dates you enter — birthdays, deadlines, anniversaries — never leave your device. The first live tool is the Age Calculator, which gives an exact age in years, months and days from a date of birth, handling leap years correctly, plus total days lived, the day of the week you were born, and your next birthday. Later batches add a date duration calculator, a countdown timer, a business-days calculator, a time-zone converter, a week-number finder and a Unix timestamp converter. Everything is free with no sign-up, and the tools work offline once the page has loaded — useful when you are planning around dates with no signal, or checking a deadline quickly on your phone. The tools also handle the awkward cases properly — leap years, month-end borrowing and dates far in the past — instead of approximating with 365-day years. Results are shown plainly, with the working visible so you can trust the answer.