Julian day Number and Civil Date Calculator
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(Edit the following field for interval calculations.)
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- 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.)
- In Auto mode, civil calendar changes from Julian to Gregorian
between October 4/15, 1582. For Julian civil dates after that date,
as in England and colonies until 1753, select Julian Only.
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Copyright (C) 1998 by Numerical Recipes Software. Permission is
granted for unlimited copying and redistribution, provided that
this copyright notice, and the following link are preserved. 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).
Numerical Recipes home page
2005 July 11