📅 Date & Time tools

Age, date-difference, timezone and countdown tools. All free, all running locally in your browser.

Get the ordinal day of a date and the days left in that year.

Look up the ISO week number, week-year and Monday start for any date.

Convert epoch seconds or milliseconds to dates, and dates back to Unix timestamps.

Calculate your exact age in years, months and days — plus total days lived, day of birth, zodiac sign and countdown to your next birthday. Free.