Help and Example Use
API Services for Developers
Date Calculators
- Duration Between Two Dates – Calculates number of days
- Time and Date Duration – Calculate duration, with both date and time included
- Date Calculator – Add or subtract days, months, years
- Birthday Calculator – Find when you are 1 billion seconds old
- Week Number Calculator – Find the week number for any date
Related Links
- 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