ts:referenceFrame

• http://hosi.org/When/TM/CalendarEra/LongCount
• http://hosi.org/When/TM/CalendarEra/LongCount::PHLC
• http://hosi.org/When/TM/CalendarEra/LongCount::HLC
• http://hosi.org/When/TM/CalendarEra/LongCount::NLC