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Implementing a non-terrestrial calendar

As I was looking into solutions for another question, I found myself wondering whether it was possible to use .NET's Calendar class to implement a calendar that wasn't based on Earthly conventions.

For instance, Mars' day is about 2.7% longer than a day here on Earth:

A convention used by spacecraft lander projects to date has been to keep track of local solar time using a 24 hour "Mars clock" on which the hours, minutes and seconds are 2.7% longer than their standard (Earth) durations.

Is there any good way to implement a MarsCalendar such that the length of a second is different from the standard GregorianCalendar, and thus be able to use DateTime objects based on it for all the standard AddDays(), AddHours(), etc. functions? _{(Note: Ideally, a solution - if one exists - would be applicable to any form of planetary object for which it is possible to define both "1 day" and "1 year" of consistent lengths. Mars makes for a great example, though)}

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Interesting. Would that propagate up to larger time increments, or would I have to override each one separately?
– Bobson
Commented Feb 24, 2014 at 18:14
2

After a bit more research into the other calendars, I'd guess that GregorianCalendar and the other calendars use the Ticks property of each DateTime passed to it for the math behind all of its GetX methods. It gets complicated with DateTime values, because the DayOfYear, DayOfMonth, and DayOfWeek properties are clamped to earthly values. There are no calendars built-in to the System.Globalization namespace that have more than 12 months or more than 365 days (though some have less days), so I'm guessing those clamped values can't be overridden, so you might need your own DateTime structure.
– Michael Hoffmann
Commented Mar 3, 2014 at 3:54

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Implementing a non-terrestrial calendar

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