The Program's changes
and history
Version 3.1b (Jan 2004)
Autocomplete property of year input combo box disabled. This feature was inadvertantly introduced with Delphi 6. The feature was not present in Delphi 4.
Version 3.1a (Dec 2003)
Screen resolution is now detected and a warning issued if settings are inappropriate.
Adjustment to window sizes to accommodate XP's wider borders.
Main display country no longer saved after use, permanent change by use of ini file.
Help now available in html format.
Version 3.00 (Jan 2002)
Main calendar display now offers choice of country
Drill down from comparator to give data for that day
Version 2.66 (Nov 2001)
Bug for 29th Feb AD300 corrected
Display calendar name, eg Julian etc, at bottom of screen
French republican calendar added to Comparator
Minor changes to some Comparator Julian-Gregorian change dates
Russian comparator - pre-1700 display removed, Russia had own calendar
Version 2.64 (Oct 2001)
Minor adjustment made to calculation of equinoxes - bring displayed dates more in line with historical data.
Hint for Screen-Print button corrected.
Screen print button added after user request
Version 2.60 (Aug 2001)
Date calculator enhanced. Now Adds/Subtracts to/from a given date
Version 2.5 (Sep 2000)
Secondary window focus bug fixed.
Version 2.2 (Aug 1999)
Right mouse button was implemented - now drills down from Main to Comparator screen.
Calisto is written in Delphi - a Windows programming environment based on the Pascal programming language. Calisto's origins lie in programs written in the late 1980s using the interpreted DOS language Calend-PCL. This was being used for another purpose because it made serial data collection easy - it just happened to have calendar functions based around the Julian Day, this and my interest in genealogy made it an easy starting point for programming date conversions.
Functions were later rewritten in GWBasic and then QuickBasic in its several versions. In 1995 the DOS program was named Calisto and sold to family historians in the UK. Later the program was rewritten for Windows using Delphi. Since Delphi is Pascal based, all the numerical routines had to be reworked and tested. This resulted in Calisto v2.01 being made available over the Internet as freeware in 1998.
