How to Convert to or from Roman Numerals
What Are Roman Numerals?
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Roman numbers and numerals – how do they work? -
Learn more about the Roman calendar
Help and Example Use
API Services for Developers
Date Calculators
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Time and Date Duration – Calculate duration, with both date and time included -
Date Calculator – Add or subtract days, months, years -
Weekday Calculator – What day is this date? -
Birthday Calculator – Find when you are 1 billion seconds old -
Week Number Calculator – Find the week number for any date
Related Links
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Calendar & Holidays Overview – Explore calendar tools -
Calendar Generator – Create a calendar for any year -
The World Clock – Current time all over the world -
Countdown to Any Date – Create your own countdown
