Date tools
Free date tools: what day of the week you were born, your age in days, days between dates, day of the year, week numbers, zodiac and Chinese zodiac, moon phase, Roman numeral dates and more.
Every tool explains how the answer is worked out and where people use it. Results live in the address bar, so you can share or bookmark them.
Birthday tools
Calendar & date maths
Day of the weekFind the day of the week for any date in history. Enter a date and see the weekday, the calendar in use at the time, the day number and the ISO week.Days between datesCount the days, weeks, months, weekdays and weekend days between any two dates. Works in both directions and shows the exact calendar difference in years, months and days.Countdown to a dateCount the days, weeks and hours until any date — Christmas, a birthday, a wedding, an exam or a deadline — and see which weekday it falls on.Day of the yearFind the day number for any date — day 255 of 365 — plus the days remaining in the year, the percentage elapsed, the quarter and the week number.Week numberFind the ISO week number for any date, the Monday-to-Sunday range that week covers, and how it compares with the simple week count from 1 January.Leap year checkerCheck whether any year is a leap year, see the rule applied step by step, and get the next and previous leap years plus the weekday of 29 February.
History lookups
What happened on a dateJump straight to any calendar day and see the events, births, deaths and observances recorded for it, plus the surrounding days, the month and the year.What year was N years agoCount back any number of years from today, see the century and decade it lands in, which generation was born then, and what happened that year.
Date facts & fun
Zodiac sign by dateFind the Western star sign for any birth date, with its date range, element, modality and ruling planet, plus the birthstone and birth flower for that month.Chinese zodiacFind the Chinese zodiac animal and element for any birth year, see the other years that share it, and check the Lunar New Year rule for January and February births.Birthstone & birth flowerFind the birthstone and birth flower for every month, what each one traditionally stands for, and the star signs that fall in that month.Moon phase on a dateSee the moon phase for any date — new, crescent, quarter, gibbous or full — with the percentage lit and how many days into the lunar cycle it was.Generation by birth yearFind which generation a birth year belongs to — Boomer, Generation X, Millennial, Gen Z, Alpha — with the year ranges and what defines each cohort.Roman numeral dateConvert any date to Roman numerals in every common format, and convert numerals back to numbers. Useful for tattoos, wedding stationery and engraving.