Tool to convert a date from one calendar to another, or to calculate a date using periods before or after
a date, or to select a date from a calendar widget. This tool will work for all historical dates from about
4100BC, as well as for future dates. This tool is accessible from a button next to each date field, and can
return the selected/calculated date to the field. It is also able to be used as a stand-alone utility. It
will cope with all possible calendars: Gregorian, Julian, French, Hebrew, Islamic, etc (even Mayan!). The
calendar will be aware of the Old Style/New Style switch-over dates for different countries, and will require
the entry of the country for any calculation that spans the cut-over period of 1582-1752. Dates input are
converted into Julian Period then converted into the target calendar. A Regnal Date option will also be
available.
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