1000 Day Birthday Calculator [JavaScript]

We don't get enough birthdays, and the ones that we do get are always inconveniently at the same time of year. This little toy tells you when your next 1000 day birthday falls. Any excuse for a party …

Your date of birth — Day: Month: Year:

Your birthday:
Your age: days
Next 1000 day:
1000 day after that:
Previous 1000 day:


The layout could be prettier.


I've been playing about with this idea since 1993. All it is is some simple maths on Julian dates. JavaScript makes this pretty trivial, and easy to present on the web.

Feel free to start some class of religion based on it, but don't forget who told you about it.

Copyright © 02003–02010 Stewart C. Russell, Scarborough, Ontario.

Updated 25 July 02010