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This is actually simple enough that I'm halfway tempted to just commit the changes. UTC._utc and LocalTime._localTime are immutable class variables which are the singletons for their respective classes. However, the static constructor which initialize them are not currently shared like they should be. Since immutable static variables and immutable global variables are implicitly shared, it's not a good idea to initialize them in non-shared static constructors and in fact should probably be an error (e.g. http://d.puremagic.com/issues/show_bug.cgi?id=4923 and http://d.puremagic.com/issues/show_bug.cgi?id=6114 ).