AstroPixels Calendar Date Converter

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.

Convert A Calendar Date

Gregorian Calendar Date:

Julian Calendar Date:

Julian Day Number (JD):

Day of Week:

Calendar In Use On Above Date:

Convert Another Calendar Date

Gregorian Calendar Date:

Julian Calendar Date:

Julian Day Number (JD):

Day of Week:

Calendar In Use On Above Date:

Number of Days Between Above Dates

Number of days between the above two dates: days

Notes

  1. You must have Javascript enabled in your browser for this calculator to work.
  2. All fields are editable. Change civil date to calculate Julian Day Number and day-of-week, or vice versa.
  3. After changing a text box, click outside of the calculator, or press tab, to update all other data.(Don't press return.)
  4. 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 Calendar Date Calculator (July 2007).

Permission is freely granted to reproduce this data when accompanied by an acknowledgment:

"Predictions by Fred Espenak, AstroPixels.com"

Related Links