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ECO is a tool for creating model driven applications in Microsoft Visual Studio. Featuring full code generation, DB generation, and O/R mapping, ECO is the perfect for getting the job done fast.

Adds or subtracts a number of days or months to a date, calculates the number of days between two dates, and converts among dates in various solar calendars: Gregorian, Julian, ISO 8601 Week, Hermetic Leap Week and day-in-year (yyyy-ddd).