Show date today in windows tray when move mouse slowly on it's icon in the windows taskbar. shows you three date according to three calendar Persian(shamsi), Islamic(qamari) and Gregorian and by right clicking on it's icon a form will appear and gives the ability to enter any date and convert it to another two date.
It's a free Calendar for individual use.

• 7000 Years Calendar 1.3.
  The Program demonstrates local time and date for chosen calendar (Julian, Gregorian, Indian, Ancient Egyptian, Coptic, Ethiopian, Hebrew, Islamic, Khayam, Persian, Slavic-Aryan)...

• 7000 Years Calendar 1.4.5
  The Program demonstrates local time and date for chosen calendar (Julian, Gregorian, Indian, Ancient Egyptian, Coptic, Ethiopian, Hebrew, Islamic, Khayam, Persian, Slavic-Aryan) for various locations on Earth, number of the Julian Day, number of the day in the year, number of days in the year, local time of Sun/Moon rise/set, Moon age, dates of vernal/autumnal equinox and summer/winter solstice, time and type of solar and lunar eclipses, horizontal coordinates of the Sun, Moon and Planets, as well as holidays and memorial days of many countries and religions of the world: Christianity, Judaism, Islam and Ingleaism

• Millennia Calendar 2.0.0
  Millennia Calendar displays date and time for any locations on the Earth; includes 12 traditional and modern calendars (Julian, Byzantine, Gregorian, Indian, Ancient Egyptian, Coptic, Ethiopian, Hebrew, Islamic, Khayam, Persian, Slavic-Aryan); spans...

• AllDay 7.0.
  AllDay v7