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TimeZoneInfo.SupportsDaylightSavingTime is documented thusly in MSDN:
"Gets a value indicating whether the time zone has any daylight saving time rules."
I would therefore expect that if it returns true for a particular zone, a call to GetAdjustmentRules() will return a non-empty array - and this is the case in .NET.
Under Mono 2.10.8, *every* TimeZoneInfo reports that it supports daylight saving time, even if it doesn't have any rules.