To convert, simply enter in a date in one of the formats.
When finished the date is automatically given in the other
available formats. The weekday is then
automatically given in the topmost fields.
You must have Javascript enabled in your browser for
this calculator
to work. Requires Netscape 3.0 or Internet Explorer 3.0 or later for
correct operation.
All fields are editable. Change civil date to
calculate Julian
Day Number and day-of-week, or vice versa.
After changing a text box,
click outside of the calculator, or press tab, to update all other
data.
(Don't press return.)
Auto mode is used, meaning that the civil calendar changes
from Julian to
Gregorian
between 1582 October 4 and 1582 October 15. For Julian civil dates after that
date, as in England and colonies until 1753, these dates must be
converted to Gregorian dates first.
All
calculations are embedded as JavaScript, so an exact copy of this page's source code will generally work
from any server (no CGI script needed).
Special thanks to National Space Club summer intern Sumit Dutta
for his valuable assistance in preparing the Julian Day and Civil Date Calculator (July 2007).
Permission is freely granted to reproduce this data when accompanied by an acknowledgment:
