DateCalculator is a Java Swing application that can perform three kinds of computation on calendar dates:

Increment

Add a number of days to a date or subtract a number of days from a date (eg, find the date 100 days after today).

Difference

Calculate the number of days between two dates (eg, find the number of days from the start of next week to the end of the year).

Interval

Generate a sequence of dates with a given number of days between each successive pair of dates (eg, make a list of all the Saturdays in the next four years).

It uses the Gregorian calendar for all dates, and it accepts input dates between the years 1600 CE and 3999 CE. Dates output by DateCalculator are displayed in user-defined formats. In those formats, the names of days and months may be obtained from a Java locale (a language, or a language and a country) or they may be user-defined.

Links

• Source code
• Manual  (Single HTML file)
  (JavaScript must be enabled in your browser in order to generate the manual's table of contents.)
• Screenshot of DateCalculator

Licence

DateCalculator is made available under two licences:

• The contents of the uk.blankaspect.datecalculator package (including resources) may be used under the terms of version 3 of the GNU General Public License.
• All other contents of the blankaspect/dateCalculator repository may be used under the terms of the MIT License.